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Euclid R2Drew2 Edition Paper 1 · Q2

Paper 1Number & counting

An integer n≥3n\geq3 has the following property:

In the expansion of

(1+x)n(1−x),(1+x)^n(1-x),

the coefficient of x2x^2 is equal to the coefficient of x3x^3.

What is nn?

A55
B66
C77
D88
E99
F1010

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