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January 10th, 2007, 02:03 PM   #1
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Fourth term

find the fourth term of (x + 2y)^6
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January 10th, 2007, 02:23 PM   #2
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In the general equation (a+b)^x, the (n-1)th term is xCn[a^(x-n)][b^n], where nCa is equal to x!/[n!(x-n)!] (where x!=x(x-1)(x-2)...*3*2*1 for all positive integers x, and 0!=1).
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January 28th, 2007, 09:37 PM   #3
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That formula was for the (n+1)th term.
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