Question

solve this problem pls quickly
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Answer 1

Answer:

Step-by-step explanation

Ap is 31 , 29, 27 .......3

A=31 , an = 3 , d ,29-31= -2

An = a+(n-1)d

3 = 31+(n-1)(-2)

3-31 = -2n+2

-28-2 = -2n

-30 = -2n

N = -30/-2 = 15

Sn = n/2 [a+an]

= 15/2 (31+3)

=15/2×34

= 15×17 = 255

Hope it helps

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Answer 2

The sum of the series is 255.

Refer the attachment