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Deepak Bora
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Find the sum of 51 terms of the AP whose second term is 2 and the 4th term is 8.

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ICSE & CBSE Board Question Based on Arithmetic Progression of RS Aggarwal
Here the two term of AP is given and you have to find the sum to n terms.
This is the Question Number 17 Of Exercise 11 C of RS Aggarwal Solution.

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1 Answer

  1. a + d = 2

    a +3d = 8

    2d = 6

    d = 3

    a+3 = 2

    a = -1

    51 term = -1 + 50×3 = 149

    Sum = (51/2)(-1+149)

    = 51× 74

    = 3774

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