the sum of 3rd and 15th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13th elements of the same progression.then the elements of the series should necessary be equal to zero
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Answer:
the answer is :12th element
Explanation:
a+2d+a+14d=a+5d+a+10d+a+12d
2a+16d=3a+27d
a+11d=0
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