1.

Number of words consisting of two vowels and two consonants which can be made out of the letters of word "DEVASTATION" is

Answer»

126
198
1512
1638

Solution :DVSTIN, EAAIO :
`(.^(5)C_2 XX .^(4)C_(2))4 ! + .^(5)C_(2) (4!)/(2!) + .^(4)C_(2) (4!)/(2!) + 1 + (4!)/(2!2!)`


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