1.5, 2.3, 3.1, 3.9, ?

A ) 4.4

B ) 4.2

C ) 4.5

D ) 4.7 ✅

Explanation: 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
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