1.

Find the number of permutations of the letters of the word CONTRADICTORY such that neither the pattern "CON" nor "RAD" nor "ORY" appears

Answer»


ANSWER :`(13!)/((2!)^(4))- (11!)/(2!.2!)-(111)/((2!)^(3))-(11!)/(21.2!) + (91)/(2!) + (9!)/(4!) + (9!)/(2!) -(7!)/(2!)`


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