Question

For what value of x; the sequence x+1, 3x, 4x+2 are in AP?(a) 3(b) 2(c) 4(d) 5

Answer 1

If a,b,c are in AP then :

a+c=2b

Here:

x+1+4x+2=6x

5x+3=6x

x=3 is the answer.