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1(a)How many different sequences of heads and tails are possible if a coin is flipped 100 times? Using the fact that 2 10 =1024 is

1(a)How many different sequences of heads and tails are possible if a coin is flipped 100 times? Using the fact that 210=1024 is approximately equal 1000=103 ,give your answer in terms of an(approximate)power of 10.

(b)How many four-letter "words" (sequence of any four letters with repetition)are there? How many with no repeated letters?

(c)How many ways are there to pick a man and a woman who are not husband and wife from a group of n married couples?

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