Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2022 (14.03.2023) Shift-I (Education)
What number would replace the question mark in the series 2, 9, 20, 35, 54, 77, ?, 135
A131
B104 ✓ Correct
C125
D98
Correct answer: (B) 104 — The answer is 104.
Explanation
★The answer is 104.
★Each term follows the pattern the sum of two consecutive numbers times the next counting number.
★For example three plus four times five gives 35, and four plus five times six gives 54.
★Continuing, five plus six times seven gives 77.
★The next term is six plus seven times eight, which is 104.
★The following term seven plus eight times nine gives 135, confirming the pattern.
★So the answer is 104.
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