Which of the following numbers will replace the question mark (?) in the given series? 73, 57, 43, 31, ?, 13
21
The correct answer is 21.
Various types of patterns can be used to construct number series, including simple arithmetic or geometric progressions, patterns involving squares, cubes, or other powers, alternating series, and series where the differences between terms follow a specific pattern (as seen in this question). Sometimes, you might need to look at the differences of the differences (second-order differences) to find a consistent pattern. Becoming familiar with common number sequences (like primes, squares, cubes) and practicing different types of series problems helps improve speed and accuracy in identifying patterns.
Similar Questions
Which of the following numbers will replace the question mark (?) in the given series?
6, 8, 11, 16, ?, 34, 47, 64
Which number will replace the question mark (?) in the following series?
11, 19, ?, 49, 79, 128
Select the option that represents the letters which when sequentially placed from left to right in the blanks below will complete the letter series.
P _ I _ Y _ O _ U Y P _ K U _ P O _ _ Y
Which of the following numbers will replace the question mark (?) in the given series?
98, 97, 101, 92, ?
Which of the following numbers will replace the question mark (?) in the given series?
8, 15, 25, 38, ?, 73
Which of the following numbers will replace the question mark (?) in the given series?
7, 7, 5, 15, 11, 55, 49, 343, ?
Which of the following numbers will replace the question mark (?) in the given series?
66, 86, 126, ?, 366
Which of the following numbers will replace the question mark (?) in the given series?
54, 46, 34, 26, 14, ?
Which of the following numbers will replace the question mark (?) in the given number series?
25, 115, 214, 322, ?, 565, 700
Which of the following numbers will replace the question mark (?) in the given series?
23, 25, 28, 33, ?, 51, 64
Important Questions from Number Series
What will come in place of question mark (?) in the following number series?
2, 5, 11, 23, 44, 77, ?
What will come in place of question mark (?) in the following number series?
31, 32, 36, ?, 61, 86
What will come in the place of question mark (?) in the following number series?
3, 6, 18, ?, 630, 6930
What should come in place of the question mark ‘?’ in the following number series?
60, 40, 50, ?, 180, 460
A series is given with one term wrong. Select that wrong term from the given alternatives.
J12, M24, P48, S96, U192
