Reading Questions 1b

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Problem 1. 

How many ways can you choose 4 kittens from a litter of 9?

 


Problem 2. 

How many sequences of 8 nucleotides can be made using any of the 4 nucleotides A, C, G, T at each place of the sequence?

 


Problem 3. 

Suppose a sequence of 8 nucleotides contains 2 each of A, C, G, T.

How many such sequences are there?

 70
 1120
 2520
 37800