Question
Select the number from among the given options that can
replace the question mark (?) in the following series. 7, 9, 15, 49, 191, ?, 5759.Solution
The logic is: 7 × 1 + 2 = 9 9 × 2 – 3 = 15 15 × 3 + 4 = 49 49 × 4 – 5 = 191 191 × 5 + 6 = 961 961 × 6 – 7 = 5759 So, the missing number is ‘721’
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