6-2=4, 12-6=6, 20-12=8, 30-20=10
Differences go 4, 6, 8, 10... next is 12
So 30 + 12 = 42
Last updated 07 Nov 2026 by NA
The sequence is an Arithmetic Progression (AP).
First term (a) = 20
Common difference (d) = 5
Last term (l) = 140
Formula
n = l -a / d + 1
n = 140 -20/5 +1
n = 24 +1
n = 25
Last updated 08 Nov 2026 by NA
Average is equal to sum of all numbers and divided by Total numbers
= 9+18+27+36+45 = 135/5
=27
3+1 = 4
4+3 = 7
7+1 = 8
8+3 = 11
11+1 = 12
12+3 = 15
Last verified on 03-09-2026
The sequence is arranged in groups where the numbers increase by 2:
So after 24, 26, the next number is:
26 + 2 = 28
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