A. 5: 4

B. 31: 24

C. 30: 23

D. 31 : 25

The 111th digit of the series 149162536496481........ is?

]]>how many perfect squares of natural numbers between 30000-50000 are there whose last two digits end with 81?

]]>as 212 in base b and 128 in base b + 2.

13.

The value of a + b in base 10 is

1. 219

2. 125

3. 114

4. 107