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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