Wed March 31, 2010 By: Soukarsha Dhar

permutation and combination

Expert Reply
Wed March 31, 2010

To make a 4 letter word consisting of 2 vowels and 2 consonants

there are 21 consonents and 5 vowels

2 types of letters at 4 places can be done in 4C2 ways

Two consonanats can be selected in 21X21 ways

Two vowels can be done in 25 ways

total ways = 6x25x441

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