Question

How many terms of the AP 63,60,57,542, ... must be taken so that their
sum is 6932 Explain the double answer.​

Answer 1

Answer:

21 or 22

Step-by-step explanation:

The given AP is 63, 60, 57, 54,……….. Here, a = 63 and d = 60-63 = -3 Let the required number of terms be n.

refer to the attachment

So, the sum of 21 terms as well as that of 22 terms is 693.

refer to the 2nd attachment

This is because the 22nd term of the AP is 0 Hence, the required number of terms is 21 or 22