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If in an A.P., the sum of first m terms is n and the sum
of its first n terms is m, then prove that the sum of its
first

By Nevaeh

If in an A.P., the sum of first m terms is n and the sum
of its first n terms is m, then prove that the sum of its
first (m + n) terms is – (m + n).​

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Nevaeh

2. Ratio of present ages of A and B is 16 : 7. After 12 yr,
A’s age is twice of B’s age, then find present ages of A
and

47. The third term in the expansion of
({2x+ 3)}^5 is
*
72x
720x
72×2
720×3​

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