Question

 Consider a population consisting of 4, 7, 8, 13, 15 and 17. Suppose samples of size 3 are drawn from this population. Determine the total number of samples.

Answer 1

$Size\,\,of\,\,population\,\,6\\Size\,\,of\,\,sample\,\,3\\Number\,\,of\,\,samples\,\,C_{6}^{3}=\frac{6!}{3!3!}=20$