How many words of 4 consonants and 3 vowels can be made from 12 consonants and 4 vowels, if all the letters are different?
A. 16C7 × 7!
B. 12C4 × 4C3 × 7!
C. 12C3 × 4C4
D. 11C4 × 4C3
Answer: Option B
Solution(By Examveda Team)
4 consonants out of 12 can be selected in,12C4 ways. 3 vowels can be selected in 4C3 ways. Therefore, total number of groups each containing 4 consonants and 3 vowels, = 12C4 × 4C3 Each group contains 7 letters, which can be arranging in 7! ways. Therefore required number of words, = 12C4 × 4C3 × 7!Join The Discussion
Comments ( 1 )
Related Questions on Permutation and Combination
A. 3! 4! 8! 4!
B. 3! 8!
C. 4! 4!
D. 8! 4! 4!
A. 7560,60,1680
B. 7890,120,650
C. 7650,200,4444
D. None of these
A. 8 × 9!
B. 8 × 8!
C. 7 × 9!
D. 9 × 8!
ANS. is 12×11×10×9×4×3×2