When

, you have

Now assume this is true for

, i.e.

and under this hypothesis show that it's also true for

. You have




In other words, there exists

such that

Rewriting, you have



and this is equivalent to

modulo 9, as desired.
Answer:
A. 6:7
Step-by-step explanation:
if you put the numbers together like so: 42:49 you can divide both sides by 7 and you would get 6:7
HOPE THIS HELPS!