Q17 of 25 Page 8

Prove that (x2 – y)6


We have Tr + 1 in (a + b)n = nCran - r. br ,0 ≤ r ≤ n
Tr + 1 in (x2 - y)6 = 6Cr(x2)6 - r (-y)r
                       = 6Cr x12 – 2r (-y)r

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