Paragraph: Let a denotes number of digits in 2^ 50 , b denotes...

Paragraph: Let $a$ denotes number of digits in $2^{50}, b$ denotes number of zero's after decimal and before first significant digit in $3^{-50}$ and $c$ denotes number of natural numbers have characteristic 3 with base 5 , then (Given: $\log _{10} 2=0.301$ and $\log _{10} 3=0.4771$ )Question: Number of factors of the number $a+b$ are: