Q1. What is theof the product $\displaystyle (3^{75})(2^{113})$units digit

was not sure of what "units digit" meant but this comes out to be

$\displaystyle

6.31 × 10^{69}

$

otherwise how is this found?

Q2. The product of three different positive intergers is 2010. What is the maximum possible sum of the intergers?