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B
780
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C
1040
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D
520
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Solution
The correct option is A990 Coefficient of x4 in (1+x+x2+x3)11 is
= coefficient of x4 in (1+x)11.(1+x2)11
= (coefficient of 1 in (1+x11)).(coefficient of x4in (1+x2)11)+(coefficient of x2in(1+x)11).(coefficient of x2 in (1+x2)11)+(coefficient of x4 in (1+x)11).(coefficient of 1 in (1+x2)11)