Question

If 18,a,b,-3 are in AP then a+b=

Answer 1

Answer:

First term=f

f=18

f+3d= -3

18+3d= -3

3d= -21

d= -7

Second term=a=f+d=18-7=11

Third term=b=f+2d=18-14=4

a+b=11+4=15

Answer 2

Answer:

answer is 15

Step-by-step explanation:

t1=18,t2=a,t3=b and t4=-3

in a.p. always ..,

:t2-t1=t4-t3

:a-18=-3-b

:a+b=-3+18

:a+b=15

please mark the brealiant answer ..