Question

What will come in place of the question mark (?) in the following series?

1.5, 3.5, 9.5, 27.5, 81.5, 243.5, ?

A 730.5 Correct Answer Incorrect Answer
B 719.5 Correct Answer Incorrect Answer
C 729.5 Correct Answer Incorrect Answer
D 709.5 Correct Answer Incorrect Answer
E 739.5 Correct Answer Incorrect Answer

Solution

1.5, 3.5, 9.5, 27.5, 81.5, 243.5, ? 1.5 × 3 – 1 = 3.5 3.5 × 3 – 1 = 9.5 9.5 × 3 – 1 = 27.5 27.5 × 3 – 1 = 81.5 81.5 × 3 – 1 = 243.5 243.5 × 3 – 1 = 729.5

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