Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2022 (11.03.2023) Shift-II (Computer)
What number would replace the question mark in the series: 1, 4, 11, 26, 57, 120, 247, ?
A424
B367
C255
D502 ✓ Correct
Correct answer: (D) 502 — The next number is 502, so the answer is 502.
Explanation
★The next number is 502, so the answer is 502.
★Each term is the previous term doubled and then a rising number is added.
★1 times 2 plus 2 gives 4, and 4 times 2 plus 3 gives 11.
★11 times 2 plus 4 gives 26, and so on up to 247.
★So the next term is 247 times 2 plus 8.
★That is 494 plus 8, which is 502.
★So the answer is 502.
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