Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2022 (11.03.2023) Shift-II (Sociology)
Find the 51st term of the following series: 12, 13.5, 15, 16.5, 18, …
A78
B87 ✓ Correct
C89
D85
Correct answer: (B) 87 — The 51st term is 87, so the answer is 87.
Explanation
★The 51st term is 87, so the answer is 87.
★The series is an arithmetic progression starting at 12.
★Each term rises by a common difference of 1.5.
★The 51st term is 12 plus 50 times the common difference.
★That is 12 plus 50 times 1.5, which is 12 plus 75.
★That equals 87.
★So the answer is 87.
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