Instructions

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

Question 86

7, 13, 31, 85, 247, ?

Solution

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Each number is multiplied by 3 and then 8 is subtracted from it.

7 $$\times 3 - 8$$ = 13

13 $$\times 3 - 8$$ = 31

31 $$\times 3 - 8$$ = 85

85 $$\times 3 - 8$$ = 247

247 $$\times 3 - 8$$ = 733

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