A) \[{{105}^{5}}\]
B) \[210\times 243\]
C) \[105\times 243\]
D) \[150\times {{21}^{2}}\]
Correct Answer: D
Solution :
[d] Let us first select two places for vowel, which can be selected from 4 places in \[^{4}{{C}_{2}}\]ways. Now this places can be filled by vowels in \[5\times 5=25\]ways as repletion is allowed. The remaining two places can be filled by consonants in \[21\times 21\]ways. Then the total number of words is \[^{4}{{C}_{2}}\times 25\times {{21}^{2}}=150\times {{21}^{2}}\].
You need to login to perform this action.
You will be redirected in
3 sec
