If the sum of first' p 'terms of an AP is ap x p+bp,find it's common difference

Asked by  | 18th Nov, 2012, 09:32: AM

Expert Answer:

Let p = 1

S1 = a( 1)+ b* 1 = a + b = a1

S2 = a ( 2 )2 + b*2 =4a + 2b

Therefore a2 = 4a + 2b -a - b = 3a + b

Therefore common difference = a2 - a1 = 3a + b - a -b = 2a

Answered by  | 18th Nov, 2012, 09:44: AM

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