Which number will replace the question mark (?) in the following series?
7, 14, 33, 70, 131, ?
Difference between consecutive numbers have been taken.
$$14-7=7,\ 33-14=19,\ 70-33=37\ and\ 131-70=61\ .$$
again, these 7,19,37,61 are also in a series in following manner.
$$19-7=12,\ 37-19=18,\ 61-37=24.$$
So, next number will be added by 30 to 61(which will be 91). And it will be added to 131.
So, required number is $$=131+61+30=222.$$
option D is correct.
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