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if n is an even integer and a,b,c are disinct terms,in the expansion of(a+b+c)^n+(a-b-c)^n, is (a)n^2-1 (b)(n^2-1)/2 (c)((n+1))^2/4) (d)(n+2)^2/4
The ques is incomplete i suppose,what are we supposed to find in the expansion,the coefficient of what is not mentioned. Complete the ques and then let us help you .
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