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Euclid Sample Paper 1 · Q2

Paper 1Algebra

What is the coefficient of x9x^9 in the expansion of

(1−x)7(1+x+x2)7?(1-x)^7(1+x+x^2)^7?
A−84-84
B−35-35
C−21-21
D00
E3535
F8484

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