Question

Find the number of terms of series 21, 18, 15, 12... which must be taken to give a sum of zero​

Answer 1

Answer:

Now it is given that the sum of the given AP series is 0. So, we have to equate the formula of the sum of n number of terms in an AP equals to 0 and then by solving we will get the value of n (number of terms). Hence, 15 terms of the given AP series is added to get the sum zero.

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