Question

What row of Pascal's triangle should be used when looking for the number of ways 15 students can be selected from a class of 32 students?

A) 14
B) 15
C) 31
D) 32

Answer 1

im gonna say the answer is b

Answer 2

the number of ways 15 students can be selected from a class of 32 students

Here the number of students to be selected = 15

And the total number of students = 32

So the Number of ways 15 students can be selected from a class of 32 students should be

32 C 15 ,

it means we have to solve 32 C 15 ,

for this we need to see the 15th row of the pascals triangle.