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B
605
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C
990
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D
1120
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Solution
The correct option is C990 (1+x+x2+x3)11 =(1+x2)11(1+x)11 =(1+11x2+11C2x4+...x22)(1+11x+11C2x2+...x11) Hence coefficient of x4 will be 1×11C4+11×11C2+11C2×1 =11C4+12×11C2 =330+660 =990