Questions
If sum of first 20 terms of an A.P. is equal to sum of first 30 terms of the A.P. then sum of the first 50 terms of the A.P. is
detailed solution
Correct option is B
Let a be the first term and d be the commondifference of the A.P., thenS20=S30⇒ 202[2a+(20−1)d]=302[2a+(30−1)d]⇒ 2a+49d=0Now, S50=502[2a+(50−1)d]=0.Similar Questions
If the sum of first terms of an is , then the sum of squares of these terms is
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