# Number Series Tricks, Questions and Videos

## Special Type of Series

(a) Numbers followed by their LCM or HCF.

For example: 1, 2, 3, 6, 4, 5, 12, 60, 5, 6, 7 ….
In the above series, every four numbers forms a block in which the fourth number is the LCM of first three numbers. Therefore, the number next to 7 is 210. i.e. LCM of 5, 6, 7 = 210

(b) Numbers followed by their product.

For example:
1, 2, 2, 4, 8, 32, ……
1×2=2;2×2=4;2×4=8;4×8=32;8×32=256,
Which is the next number in the series.

(c) By use of digit sum. For example: 12, 15, 21, 24, 30, ..
Next number = previous number + Digit-sum of previous number.
i.e., 15 = 12+(1+2)
21=15+(1+5)
24=21+(2+1)
30=24+(2+4)
∴ Next number = 30 +(3+0)= 33

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## 3 Responses to “Number Series Tricks, Questions and Videos”

1. Comment made by Sohan on Mar 20th 2019 at 12:32 am: Reply

sohanchopra213@gmail.com

2. Comment made by Showkat Bashir on Dec 11th 2019 at 3:42 pm: Reply

Send me reasoning,arthamatic, comprehension at my email id princeshowkat786@gmail.com