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The sum of first 30 terms of an A.P. is equal to sum of its first 20 terms. Show that the sum of the first 50 terms of the same A.P. is zero.?
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The sum of first 30 terms of an A.P. is equal to sum of its first 20 t...
I think the whole A.P. is 0,0,0,0,0,...... that's why the a30=a20 and hence a50=a+49d

0+49(0)=0 ......
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The sum of first 30 terms of an A.P. is equal to sum of its first 20 terms. Show that the sum of the first 50 terms of the same A.P. is zero.?
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