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anonymous
 3 years ago
Find the 7th term of (x^2 + 3y)^9
anonymous
 3 years ago
Find the 7th term of (x^2 + 3y)^9

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amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0given: \[(p+q)^n\] we can work out the middle stuff as:\[p^{nc}q^c\] the coeeficient is a little tricker unless you know about combinatorics

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0and c is the "term" value :)

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0n choose c is what i think i recall for the coeff; or else draw up the pascal triangle

shubhamsrg
 3 years ago
Best ResponseYou've already chosen the best response.0dw:1358788894374:dw This is the working formula.

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0that looks about right, but if i remember it correctly: the first term starts at 9 and drops down till it hits the 7th term

shubhamsrg
 3 years ago
Best ResponseYou've already chosen the best response.0The first term's coefficient is 1 , when r=0,

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0(a+b)^9 a^9 a^8 a^7 a^6 a^5 a^4 a^3 ^^^ b^0 b^1 b^2 .... b^6 ^^^ these always get turned around in my head
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