Question

The maximum value of the sum of the A.P. 70,66,62,58,54,..... is

Answer 1

Step-by-step explanation:

this A.P

70,66,62,58,54,50........6,2,-2,-4 and so on

2 is number which last positive in the series.

and it's 18th number in the series

hence sim from 70 to 2 of the series is

sum = n/2 ( a + l)

where n is the last number position here n=18

a is first nitin the series here a=70

and l is the last number in the series here l= 2

hence

maximum sum = 18/2 (70+2)

=9*(72)

=648

answer will be 648