A population consist of five (5) measurements 2,3,5,6 and 7.How many different samples of size n=2 can be drawn from the population?

Question

A population consist of five (5) measurements 2,3,5,6 and 7.How many different samples of size n=2 can be drawn from the population?

a.

7

b.

8

c.

9

d.

10

Answer 1

5C2 = 5!/3!2! = 10

d is correct

Pascal's Triangle 6th row is 5C0, 5C1, 5C2, 5C3, 5C4, 5C5. You want 5C2, 3rd entry, 6th row

1

11

121

1331

14641

1-5-10-10-1