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If the sum of first 11 terms of an A.P....

If the sum of first 11 terms of an `A.P., a_(1),a_(2),a_(3),....` is `0(a_(1)!=0)` then the sum of the `A.P., a_(1), a_(3),a_(5), ......,a_(23)` is `k a_(1)`, where k is equal to :

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