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Mathematics
Hannah Frederick
22 April, 17:37
Find the 4th term of (x-y) 12
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L
Lexi Stein
22 April, 20:19
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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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