Question

18. 11, 13,20,48,111,?
a) 237
c) 273
b) 125
d) 255​

Answer 1

Answer : 237

EXPLANATION :

In the above series the pattern is :

11 + 1³ + 1 = 13

13 + 2³ - 1 = 20

20 + 3³ + 1 = 48

48 + 4³ - 1 = 111

We should add cubes of consecutive natural numbers to the sums, add and subtract 1 alternatively.

Then,

111 + 5³ + 1 = 237

Therefore, the number is 237.

Answer 2

11,13,20,48,111

13-11= 2 = 1^3 +1

20-13 = 7. = 2^3 -1

48-20= 28. = 3^3 +1

111-48 = 63 = 4^3 -1

So next would be 5^3 +1 = 126

So no is 126+111 = 237