Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2021 June 2022 (12.07.2022) Shift-II
Find the missing number in the sequence: 4, 9, 20, 43, 90, ?
A180
B185 ✓ Correct
C133
D190
Correct answer: (B) 185 — The answer is 185.
Explanation
★The answer is 185.
★Each term is the previous one doubled plus a rising counter.
★So 4 times 2 plus 1 is 9, and 9 times 2 plus 2 is 20.
★Then 20 times 2 plus 3 is 43, and 43 times 2 plus 4 is 90.
★The next term is 90 times 2 plus 5.
★That is 185.
★So the answer is 185.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Shared by Mcqkart · via Mcqkart.in