Answered

A school survey found that 3 out of 10 student walk to school. If three students are selected at random with replacement, what is the probability that all 3 walk to school?​.

Sagot :

DanLester69viz

Answer:

120

Step-by-step explanation:

Given ( n=10 , r=3 )

Formula: C= n! / (n-r)! r!

C= 10! / (10 - 3)! 3!

= 10! / 7! 3 !

= 10 • 9 • 8 • 7! / 7! 3!

= 720 / 3•2!

= 720 / 6

= 120