Reasoning :: Number Series :: Number Series 1

• Number Series - Number Series 1
• Number Series - Number Series 2

Find the next number of the series 3,8,15,24....

Answer:

Explanation:

$3=2^{2}-1$,

$8=3^{2}-1$,

$15=4^{2}-1$,

$24=5^{2}-1$

So, next should be $6^{2}-1 =35$

Find the next number of the series 2,4,3,9,4,16....

Answer:

Explanation:

The number follwed by its square.

 2 then$ 2^{2}$,

3 then $3^{2}$,

4 then $4^{2}$,

So, next number should be 5

Find the next number of the series 1,4,9,16...

Answer:

Explanation:

Square of the numbers respectively .

FInd the number in the series 2,6,12,20,30.....

Answer:

Explanation:

1st soln:
Increasing even number difference. 
Difference between 6 & 2 is 4
12 & 6 is 6 and so on.
20 & 30 is 10 and next should be 12.

So, 30+12=42

2nd soln:

$2=1\times2$
$6=2\times3$
$12=3\times4$
$20=4\times5$
$30=5\times6$

So, next should be product of 6 & 7.
$7\times6=42$

Find the number in series 4,20,80,240...

Answer:

Explanation:

Term multiply with decreasing factor.
$4\times5=20$
$20\times4=80$ 
$80\times3=240$

So, next product difference is 2 so $240\times2 = 480$

• Number Series - Number Series 1
• Number Series - Number Series 2