Q21 of 89 Page 51

Find the sum









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20

The first term of an AP is – 5 and the last term is 45. If the sum of the terms of the AP is 120, then find the number of terms and the common difference.

 21

Find the sum

1 + (–2) + (–5) + (–8) + …+ (–236)

 21

Find the sum

 22

Which term of the AP – 2, - 7, - 12, … will be - 77? Find the sum of this AP upto the term - 77.