How many 2 digit prime numbers can you make make with 2,3,7,9 without repeating a digit?

So you can make 6 prime numbers.

6

Hope you could get an idea from here.

Doubt clarification - use comment section.

Hey mate!

Step-by-step explanation:

Lets take two places _ _

Now first position is filled in 4 ways (can use 2 3 7 9) that implies 4C1

then second position is filled in 3 ways since for first position we used a digit

and the condition is that not to repeat the digits, so it is done in 3C1 ways.

so the answer is 4*3 or (4C1*3C1)=12;

1.3 million hoops i believe

part a: 1.08

part b: 27.59