The coefficient of x48 in (1+x)+2(1+x)2+3(1+x)3+…+100(1+x)100 is equal to
Held on 22 Jan 2026 · Verified 6 Jul 2026.
100⋅100C49−100C48
100C50+101C49
100⋅101C49−101C50
100⋅100C49−100C50
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