Amit, you asserted the condition that the coin always flips exactly 100 times, which implies that the outcome can be determined. If you start heads up, you will always land heads up.

The point of coin tossing is that the motion is subject to many variables that are not under control and/or known, thus the outcome is 'random'.

Under these 'random' conditions, it is entirely possible to flip a coin 100 times and have them ALL land heads up (not a 2 headed coin!) It's just not very probable. Statistics tells us the probability of such a result, which BTW is 1 in 2^100, or 1 in 1,267,650,600,228,229,401,496,703,205,376, which also happens to be the total number of possible patterns for 100 'randomly' flipped coins.

And now, a test for you. You may (or may not) have noticed that I put the word random in quotes. Why do you think that is?

Brian