If the sum of first m terms of an A.P. is n and sum of first n terms of same A.P. is m, prove that sum of first (m+n) terms of it is -(m+n)
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2
Here's ur answer my friend:
Hope This Helps :)
Hope This Helps :)
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Angel2016:
Where did -m²-m² i.e. -2m² go?
Plz check the last 2 steps
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5
it is the answer of the question
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But sn≠sm
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