SPAM, SCAM - WHY THEY STILL THRIVE?

81% of spam e mails are based on pharmaceutical products. Other subjects used by spammers are weight loss, casino, college degree, phishing, performance enhancers, replica goods, and others. A software in the email system separate the spam mails based on certain words and phrases and push them into junk folder.

HOW DO THEY MAKE MONEY?
There are two factors working in the scammers favor. 1. It costs nothing to send thousands and thousands of emails. 2. If one sends millions of emails, some mails will definitely land in the in-boxes of fools who are ready to part with money to iron out some 'little problems'.
Estimates say that around 75000 people fall prey to spammers every year. A victim pays out 20000 dollars on average and the spammers make around 1.5 billion dollars a year.

THE PYRAMID SCAM
    Say, you are recruited to pyramid scheme by a friend. You pay 10 dollars to the friend and another 10 dollars to the person who recruited your friend. Then you are invited find six new people to recruit to the scheme under the same terms. You have invested only 20 dollars.
    Suppose you find 6 recruits and they find 6 new recruits each. Now the total recruits below you is 6+36. If each give you 10 dollars, you get 60+360 = 420 dollars. It is a great return.
    But there is one 'iceberg' like problem which is not visible on the surface. That is. ' you will very quickly run out of people to recruit'.

    There are 6 people in level 1.
     36 people in level 2
     216 people in level 3
    60 million people in level 10
    Even world population cannot fill up the level 13.
    people at level n = 6^n
   Total people up to level n = 6 (6^n-1)/5

People at high levels can comfortably get huge returns on their investment. But the pyramid structure tells us that there are always more losers than winners.

HOW TO SAVE OURSELVES FROM SCAMS?
1. Do not be greedy.
2. Boldly say 'No' to callers.
3. Be scientific and use logic.
4. There is no super quick remedy for any problem

FOOT NOTE
156 million fraud emails are sent every day. 8 million get opened. 800000 get clicked. 75000 fall victims. Do not be one of them.

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LISSAJOUS FIGURES

Definition: "When a particle is subjected to two sine wave motion or two oscillatory motion at right angles, the particle describes lissajous figures". We know sine wave motion and circular motion is basically same. Hence we draw two circles A and B perpendicular to each other. The circle B rotates twice faster than circle A. That is, frequency of circle B is two times than that of A. A particle at the intersection of two circles is subjected to two sine wave motion A and B at 90 degree simultaneously. The particle will describe figures depending on the frequency and phase of A and B . In our case, the ratio of frequency is 1:2 and the two waves are in phase. To draw lissajous figures : A moving point in both the circles are chosen. Here we should remember; during the time taken by the circle A to complete one rotation, circle B completes two. Hence the points are marked on the circles according to their speed. Then straight lines

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. Inverted parabola shape is used in the construction of buildings and bridges. Because the shape is able to bear more weight. A plane

CASINO'S GAME

Let us find out how the casino survives with mathematics. Say, your friend invite you for a game of dice. You must bet (wager) 2 dollars. If you roll 'six' you will get back 8 dollars. The game will go on for 30 rounds. All sounds good. The probability of rolling 'six' is 1/6. Since the game will be played for 30 times, the 'expected win' is 30*1/6 = 5. That is, you are expected to win 5 rounds out of 30. Hence your gain will be 5 * 8 =40 dollars. ok. This also implies that you will loose 25 rounds. Hence your loss will be 25*2 =50 dollars. Your net gain will be gain-less = 40-50 = -10 dollars. For 30 rounds, the loss is -10 dollars, Hence, for one round =-10/30 = -1/3 dollars. There will be a loss of -1/3 or 0.33 dollars per round. It is not a fair game. Let us make a simple formula to calculate 'Pay out per round\. The probability for a win = p The pay-out in case of win = V No. of rounds = n The expect

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