find the coefficient of X^5Y^7 in the expansion of (x-2y)^12
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Answer:
Step-by-step explanation:
12Cr × x^(12-r)(-2y)^r
∴For the term X^5 y^7
y=7
∴r=7
8th term = 12C7 × x^(12-7) (-2y)^7
=12C7×(-2^7) × x^5 y^7
=-1584 x^5 y^7
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