Question

how many terms of the AP 52,48,44.. must be taken so that the sum may be 360?

Answer 1

AP: 52,48,44.......

Here,

a = 52

d = -4

To find Sn = 360

Sn = n\2 (2a+(n-1)d)

2*360=n(2*52+(n-1)-4)

720 = n(104-4n+4)

720 = 104n -4n²+4n

4n²-108n+720 = 0

n²-27n+180 = 0

Sum of 15 terms or 12 terms of this AP is 360.

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Answer 2

Answer:

Step-by-step explanation:

Please see the two attachments below.

Hope it helps.

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