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If the sum of first p term of an A.P. is ap2 + bp, find its common difference. |
Answer» Here, sp = ap2 + bp S1= a + b S2= ax2 + bx2 = 4a + 2b S2 = a1 + a2 4a + 2b = a1 + a2 A2 = 4a + 2b – (a + b) A2 = 3a + b Now, d = common difference = a2 – a1 = 3a + b – (a + b) = 2a |
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