  # Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?

+1 vote
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Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed? posted May 19, 2014

+1 vote

Number of ways of selecting (3 consonants out of 7) and (2 vowels out of 4)
= (7C3 x 4C2)
= 210.

So number of groups, each having 3 consonants and 2 vowels = 210.

Each group contains 5 letters and number of ways of arranging 5 letters among themselves
= 5!
= 120.

Required number of ways = (210 x 120) = 25200. answer May 19, 2014

### Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?

first we select 3 consonants from 7 consonants:
By different ways
7C3=35,
and
2 vowels from 4 vowels
4C2=6,
so total ways of selecting 2 vowels from 4 vowels and 3 consonants from 7 consonants =35*6=210.
and we can arrange 5 letters 5! ways, so total ways =210*5!
=210*120
=25200. answer Apr 4, 2016
–1 vote

The 4 different consonants can be selected in 7C4 ways
The different vowels can be selected in 5C3 ways
The resulting 7 different letters ( 4 consonants & 3 vowels) can be arranged themselves in 7P7 = 7! ways..

So the answer is 7C4 * 5C3 * 7! = 35 *10 * 5040 = 1764000 answer May 19, 2014
Before solving any question read the Question atleast twice.

It is asked that to choose 3 consonants out of 7 not 4.

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