Find the number that will replace the question mark in the series: 4, 10, 20, 34, 52, 74, ?
A98
B102
C97
D100 ✓ Correct
Correct answer: (D) 100
Explanation
The next number is 100.
The differences increase by 4 each time: 6, 10, 14, 18, 22.
4 + 6 = 10, 10 + 10 = 20, 20 + 14 = 34, 34 + 18 = 52, 52 + 22 = 74.
The next difference is 22 + 4 = 26.
74 + 26 = 100.
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