Question

If18,a,b,(-3) are in



a.P then find a+b equal to how much

Answer 1

by using the property of the ap
2a=18+b
2b=a-3
now
a=2b+3
putting it in very first equation
4b+6=18+b
3b=12
therefore
b=4
so
a=11

Answer 2

11 + 4 = 15

bro

let the continuous numbers are

18,17,16,....,11,..........,4,..........,-3.

there fore find the similar distance their are 21 terms hence we require 2 . divide it by 3 to have three equal parts shown upside......

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