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CSolution :

We know, in the expansion of `(x+y)^(n)+(x-y)^(n)`, of <br> n = even, then number of non zero terms is `(n)/(2) + 1` <br> n = odd, then number of non zero terms in `(n+1)/(2)`. <br> Here, n = 11 which is odd. <br> `therefore` number of non zero terms = `(11+1)/(2)=6`.