- #1
Saitama
- 4,243
- 93
Homework Statement
If n [itex]\in[/itex] N, then 11n+2 + 122n+1 is divisible by:-
a)113
b)123
c)133
Homework Equations
The Attempt at a Solution
I did it by substituting different values of n and divided by each of the option. Answer came out to be 133.
But I want to do it step by step using binomial theorem.
When i tried to do it i did it the following way:-
[itex]\Rightarrow[/itex]121(11n) + (12)2n(12)
[itex]\Rightarrow[/itex]121(11n) + (1+11)2n(12)
Now i am not able to think what should i do next?
Thanks!