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Deepak Bora

Asked: August 11, 2020In: CBSE, ICSE

If the 5th and 12th terms of an AP are -4 and -18 respectively, find the sum of first 20 terms of the AP.

Here the two terms of an AP is given you have to find the sum of first n term of the AP This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE ...

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If the 5th and 12th terms of an AP are -4 and -18 respectively, find the sum of first 20 terms of the AP.