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12 February, 00:37

Find the 4th term of (x-y) 12

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  1. 12 February, 00:58
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    -66 x^9 y^3

    Step-by-step explanation:

    (r + 1) th term of (a + b) ^n = nCr a^ (n-r) b^r

    so the 4th term of (x - y) ^12

    = 12C2 x^ (12-3) (-y) ^3

    = 66 x^9 (-y) ^3

    = - 66 x^9 y^3 (answer)
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