The series given below contains a sequence of numbers. Accordingly identify the INCORRECT number, 40, 40, 37, 31, 21, 10
21
Find the differences between consecutive terms: 40 → 40 (0), 40 → 37 (−3), 37 → 31 (−6), 31 → 21 (−10), 21 → 10 (−11).
The first three differences are 0, −3, −6, i.e. the subtracted amount grows by 3 each time. The pattern should continue as −9 and −12.
31 − 9 = 22, and 22 − 12 = 10, which matches the last term.
So the term after 31 should be 22, not 21.
Hence, the incorrect number is 21.
Similar Questions
Which number breaks the sequence?
0, 1, 1, 2, 4, 8, 13
Monthly savings were 4000, 4400, 4840, and 5324.
Estimate the savings in the sixth month if the same trend continues.
The number of subscribers increased consistently by 10% yearly: 5000, 5500, 6050, 6655, and 7320.
The estimate for the 7th year is
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
