1*5 = 5
5*4 = 20
20*3 = 60
60*2 = 120
120*1 = 120
2 + 3 = 5
5 + 7 = 12
12 + 11 = 23
23 + 15 = 38
38 + 19 = 57
57 + 23 = 80
Last verified on 31-03-2026
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
All Rights Reserved © TestPointpk.com