Question

Find the sum of first 30terms of arithmetic progression 8,3,-2​

Answer 1

Step-by-step explanation:

just put value in the formula

the formula is sum = n/2 [2a+(n-1)d]

where a=first term, d=common difference,n=no of terms

so here n=30, a=8, d=-5

so 15 [16+ 29 x -5] => 1935