Question

What is the sum of first 10 terms of the A. P. 15,10,5,........?​

Answer 1

Here is your answer mate. step by step.

Thank me later

Answer 2

Answer:

Step-by-step explanation:

A.P.is given 15,10,5,.....

so,

first term(a) =15

common difference(d)=10-15 = -5

we have to find the sum of the first ten terms so by using

S = n/2[ 2a + (n-1)d ]

where n=10

S = 10/2[ 2×15 + (10-1)(-5) ]

S = -75

so the sum of the first 10 terms is -75

Hoping it may help you