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ICSE Class 10 Answered

19th sum
Asked by lovemaan5500 | 13 Dec, 2017, 18:22: PM
answered-by-expert Expert Answer
https://www.topperlearning.com/forums/home-work-help-19/isf-the-xth-term-of-an-ap-is-1-a-and-yth-term-is-1-bprove-t-mathematics-arithmetic-progression-general-term-of-an-ap-198761/reply
 
Same question is already been answered. Please check the above link. 
Find sum of the xy term.
Answered by Sneha shidid | 13 Dec, 2017, 18:39: PM

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ICSE 10 - Maths
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ICSE 10 - Maths
When do we use s=n/2(a+l) formula and when do we use s=n/2 x {2a+(n-1)d} formula in the sum of a.p?
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In arithmetic progression , when we use s=n/2 [2a+(n-1)d] then why use a=(n-1)d formula?
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ICSE 10 - Maths
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