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4.5.3: What is the coefficient of a) x 3 y 4 in the expansion (x + y) 7 b) x 5 y 3 in the
4.5.3: What is the coefficient of
a) x 3 y 4 in the expansion (x + y) 7
b) x 5y 3 in the expansion of (x + y)8
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