1.5, 2.3, 3.1, 3.9, ?

4.2

4.4

4.5

4.7

In this simple addition series, each number increases by 0.8.

Rule = (1st no.) (1st no. + 0.8 = 2nd no.) (2nd no. + 0.8 = 3rd number)

Now (1.5) (1.5 + 0.8 = 2.3) (2.3 + 0.8 = 3.1) (3.1 + 0.8 = 3.9) (3.9 + 0.8 = 4.7)

a = 4.7

ND-21-5-2023