Question 47
Which number will replace the question mark (?) in the following series?
14, 15, 32, ?, 400
Solution
$$14\times1+1\ =\ 14+1\ =\ 15$$
$$15\times2+2\ =\ 30+2\ =\ 32$$
$$32\times3+3\ =\ 96+3\ =\ 99$$
$$99\times4+4\ =\ 396+4\ =\ 400$$
Hence 99 will come in place of the question mark.
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