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- If the sum of the first m terms of an A.P. is n and sum of its first n terms is m, then the sum of its first (m + n) terms is
. If the sum of the first m terms of an A.P. is n and sum of its first n terms is m, then the sum of its first (m + n) terms is
A. –(m + n)
B. m + n
C. -m+ n
D. m- n
Best Answer
Answer ||| A
Solution |||
Let the first term of AP be ‘a’ and common difference be ‘d’.
Then,
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