Select the correct option that fills the blank and completes the series. 12, 15, 21, 30, ________?
42
Find the differences between consecutive terms.
15 - 12 = 3
21 - 15 = 6
30 - 21 = 9
The differences are consecutive multiples of 3, so the next difference = 12.
Next term = 30 + 12 = 42
Hence, 42.
Similar Questions
Select the option that correctly completes the series: 8, 9, 13, 22, 38, ____
Select the option that correctly completes the series: 1330, 728, 342, 124, ____
Find the next number in the given series.
3, 14, 33, 60, ?
Find the next number in the given series.
12, 21, 30, 39, ?
Find the next number in the given series.
37, 45, 53, 61, ?
Find the next number in the given series.
6, 12, 21, 32, ?
In the following number series, two numbers have been kept within brackets. Study the series carefully and select the correct option regarding the relationship of the series.
11, 101, 1001, (10001), 100001, (10000001)
Select the number that will be the next number in the following series.
0, 2, 6, 12, 20, 30, 42, 56, 72, ______
In the following number series, two numbers are placed in brackets. Study the series carefully and select the correct option regarding the series.
0, 1, 4, 9, (15), 25, 36, 49, (64), 81
Select the next number in the following series.
2500, 2400, 2200, 1900, 1500, ________
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
