# CBSE Class 10 Answered

**Find the sum of the first 17 term of an AP whose 4th term = -15 and 9th term = -30.**

Asked by arindeep.singh | 26 Jun, 2020, 03:34: PM

Expert Answer

4th term = -15 and 9th term = -90

a + 3d = -15 ... (i) and

a + 8d = -30 ... (ii)

Subtracting (ii) from (ii), we get

5d = -15

d = -3

Substituting the value of d in (i), we get

a + 3(-3) = -15

a - 9 = -15

a = -6

Sum of n terms if given by

Answered by Renu Varma | 28 Jun, 2020, 05:14: PM

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