There are 7 boys in a class of 20. Find the number of ways of selecting 3 girls and 2 boys
-
A.
1638 -
B.
2730 -
C.
6006 -
D.
7520
Correct Answer: Option C
Explanation
No of boys in the class = 7; Girls = 20-7 = 13
No of selection = (^{13}C_{3} times ^{7}C_{2} = frac{13!}{(13-3)!3!} times frac{7!}{(7-2)!2!})
= (286times21 = 6006)