If I could get some help on this as soon as possible, that would be great.
Here are the quesitons (I took a screenshot because I'm lazy like that )
2) is divisible by 3 for n = 1, 2, 3,...
The n = 1 case is trivial: .
So assume the problem is true for n = k. Then we need to show that
is divisible by 3.
Let for some integer m. Then we know that .
Now,
So .
Thus is divisible by 3.
If you know modular Mathematics:
(mod 3) then (mod 3). Thus (mod 3). Thus (mod 3).
Thus is also divisible by 3.
-Dan
7) T(0) = 1 and T(n) = 2nT(n-1). Show that .
First, to get rid of the n = 0 case:
Check!
Now,
and
Check!
So assume this is true for n = k.
We need to show that
If the theorem is true for n = k, then . So we need to show that
Well, rearranging the LHS a bit:
as advertised.
-Dan