Question

The sum of 4th and 8th term of an AP is 54 and the sum of 7th and 12th terms is 89.find the first three terms of the AP.

Answer 1

Answer:

-3

Step-by-step explanation:

A4=a+3d

A8=a+7d

And

A6=a+5d

A10=a+9d

Then

a+3d+a+7d=24

a+5d+a+9d=44

By solving we get

(1)-- 2a+10d=24

(2)--2a+14d=44

By elimination we want to do that

We get d=5

Sub d value in (1) then

We get a=-13 then do

A1=a=-13

A2=a+d=-13+(5)=-8

A3=a+2d=-13+2(5)=-13+10=-3

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