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If the coefficients of three consecutive terms in the expansion of

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If the coefficients of three consecutive terms in the expansion of (1 + x)n are in the ratio 1 : 5 : 20, then the coefficient of the fourth term is

(1) 5481 

(2) 3654 

(3) 2436 

(4) 1817

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Correct option is (2) 3654 

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