JEE Math Practice Question
If the sum of first 11 terms of an A.P., a1, a2, a3, .... is 0 (a $$ \ne $$ 0), then the sum of the A.P., a1 , a3 , a5 ,....., a23 is ka1 , where k is equal to :
- A.$${{121} \over {10}}$$
- B.-$${{121} \over {10}}$$
- C.$${{72} \over 5}$$
- D.-$${{72} \over 5}$$
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