Question

There are 12 people in a class. 10 are randomly chosen. How many possible combinations are there?

Answer 1

long way

12 x 11 x 10 x 9 x 8 x 7 x6 x5 x4 x3x2/ 10x9x8x7x6x5x4x3x2x

but you can shorten that by crossing out identical numbers so you get 12 x 11

12 x 11 = 132 combinations