Question

jane has 16 cards. ten of the cards look exactly the same and have number 1 on them. the other 6 cards look exactly the same and have the number 2 on them. jane is going to make a row contaning all 16 cards. how many different ways can she order the row?

Answer 1

8008 ways.

Explanation:

That is 16! / 10! 6!

= 16*15*14*13*12*11 / 6*5*4*3*2*1

= 16*15*14*13*11 / 6*5*2

= 16*14*13*11 / 2*2

= 4*14*13*11

= 8008.