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Question 30
Select the number that can replace the question mark (?) in the following series.
11 , 23, ? ,95, 191
Solution
$$11\times2+1 = 22+1 = 23$$
$$23\times2+1 = 46+1 = 47$$
$$47\times2+1 = 94+1 = 95$$
$$95\times2+1 = 190+1 = 191$$
Hence 47 will come in place of the question mark.
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