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Please help me With 59 Question.please explain it clearly. Hope my doubt will be solved. Thanking for helping me.

Please help me With 59 Question.please explain it clearly. Hope my doubt will be solved. Thanking for helping me.

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Grade:12th pass

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
Dear student

If you solve terms you will get a pattern

15+14+13........1
n*(n+1)/2
15*8
= 120

Regards

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