Question

Find sum of first 15 terms of an A.P. whose n term is an . th =3n+2??​

Answer 1

Answer:

Given: nth term is 3-2n.

To find: the sum of the first 15 terms of an ap.

Solution:

a1 = 3 - 2 = 1.

a2 = 3 - 4 = - 1.

d = -2.

a15 = -27.

Sum = -195.

Step-by-step explanation:

Answer 2

answer is in attachment

answer is 390

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