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Question

What term should replace the question mark ?
78, 79, 81, ?, 92, 103, 119

A
88
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B
85
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C
84
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D
83
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Solution

The correct option is B 85
The differences of terms are 1, 2, 4, 7, 11, 16, 22....
So the difference is increasing by adding 1, 2, 3, 4, 5, 6, 7....
2nd term=78+1=79
3rd term=79+1+1=79+2=81
4th term=81+2+2=81+4=85
5th term=85+4+3=85+7=92
6th term=92+7+4=92+11=103
7th term=103+11+5=103+16=119
Hence 85 replaces question mark.

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