Question
What will come in place of the question mark (?) in the
following series? 121, 115, 102, 82, 55, ?Solution
ATQ,
Check differences:
121 - 115 = 6
115 - 102 = 13
102 - 82 = 20
82 - 55 = 27
Clearly, difference increases by 7 each time:
6, 13, 20, 27 → next is 34
So, 55 - 34 = 21
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