Questions
In any A.P., if the sum of first six terms is 5 times the sum of next six terms then which of its term is zero?
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a
10th
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d
13th
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Correct option is B
According to the question, 62t1+t6=5×62t7+t12⇒t1+t1+5d=5t1+6d+t1+11d⇒8t1+80d=0⇒t1+10d=0⇒t11=0Similar Questions
If the sum of first terms of an is , then the sum of squares of these terms is
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