CA Foundation P3 · Chapter 9 · Question 1 of 9
Find the next term: 3, 7, 15, 31, 63, ?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 127
Explanation
Each term is twice the previous term plus 1: 3 x 2 + 1 = 7, 7 x 2 + 1 = 15, and so on. Next term = 63 x 2 + 1 = 127. Equivalently the terms are 2ⁿ − 1.
More Number Series, Coding and Decoding and Odd Man Out MCQs
- Q3Find the next term: 2, 3, 10, 15, 26, 35, ?
- Q4Find the wrong number in the series: 1, 8, 27, 64, 124, 216
- Q5In a certain code, MONEY is written as NPOFZ. How is LEDGER written in that code?
- Q6In a certain code, CASH is written as XZHS. How is BANK written in that code?
- Q7If TEN is coded as 39 by adding the alphabetical positions of its letters, then SIX will be coded as: