Hence
a)
b)
c)
I remember evaluating something like that at school, but when was asked today unfortunately could not produce a reasonable answer
When I was at school 55 years ago we would have done this by looking at the logarithms (to base 10) of the numbers:
It's clear from the logarithms that is considerably bigger than , and the other two numbers are several orders of magnitude smaller than either of these. So A must be quite a lot bigger than B.