Question

We have AP x-1,x+2, x-7 then find the value of x

Answer 1

given:

x-1,x+2,x-7 are IN A.P

then (x+2) - (x-1) =(x-7) - (x+2)

x+2-x+1=x-7-x-2

3=-9

:. they are not in AP