1. When we calculate the running time of an algorithm, we need counting and sum- ming a sequence of numbers heavily. What are the values (using functions +, /, 2%, log but not or ellipsis (dot-dot-dot)) of the following expressions? You may google and study these expressions. (a) n+n+ + n (the number of n's in the expression is k) (b) 1+ 2+ ...+n (c) a+at+...+a" where a is a number (d) Using the result above, what is the value of (a/(64))+(a/(64))+...+(a/(64))" where a, b and d are numbers