Question 132

What will come in place of thequestion mark (?) in the following number series?
121 238 472 ? 1876 3748

Solution

Each number is multiplied by 2 and then 4 is subtracted from it.

121 $$\times 2 - 4$$ = 238

238 $$\times 2 - 4$$ = 472

472 $$\times 2 - 4$$ = 940

940 $$\times 2 - 4$$ = 1876

1876 $$\times 2 - 4$$ = 3748

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