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The coefficient of $x^{60} in (1 + x)^{51} {(1 - x + x^{2})}^{50}$ is

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50C20

− 50C20

51C20

− 51C20

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detailed solution

Correct option is A

The coefficient of x60 in (1+x)511−x+x250 = the coefficient of x60 in (1+x)1−x350=50C20

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The coefficient of x60 in (1+x)511−x+x250 is

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The coefficient of $x^{60} in (1 + x)^{51} {(1 - x + x^{2})}^{50}$ is