The length of a'b' is the same as ab because it is the same image so it is 3 units
By the binomial theorem, the
term in the expansion of
is

which suggests that the contribution of the binomial coefficient should make up the remaining factor of 21. That is,

Step-by-step explanation:
the answer is 1 because every time the number doubles
The answer greater is probably 100
The answer is 2 because you multiply them both