Question 9

Which number will replace the question mark (?) in the following series?
4, 10, 27, 140, ?

Solution

4, 10, 27, 140, ?

$$4\times\ 2+2=10$$

$$10\times\ 3-3=27$$

$$27\times\ 5+5=140$$

$$140\times\ 7-7=973$$

Answer is 973.

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