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I can't understand the step which I marked. Please explain that to me

I can't understand the step which I marked. Please explain that to me

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Grade:12th Pass

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
5 years ago
as 1 is once, 2 is twice, 3 is thrice if you follow the same last term will be n and second last will be n-1, now as we are finding 150thterm that can be in between them so they wrote first step 2ndstep is just a formula of doing sum of n terms

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