Question

find the missing number 2,6,12,20,.......,42,56,72,90
a)28 b)34 c)30 d)32

Answer 1

(c) :30 is the missing number

Answer 2

Hi dear,

6-2 =4 (difference of 4)

12-6=6 (difference of 6)

20-12 =8 (difference of 8)

Now,

As we can see that the difference is continuously increasing by 2

So, let x will be filled

Now,

x-20 = (should be 10 [8 increased by 2] )

x-20 =10

x=10+20

x=30



Then, the blank will be filled with 30



I hope this will help you


-by ABHAY