1. If x and y are positive integers, then the last digit of
which of the following is same as the last digitof the sum of x and
y?(a) x7 + y7 (b)x13 + y13 (c) x20 + y20 (d) None of these
2. Which of the following has the maximum value?(a) 170! . 130!
(b) 150! . 150! (c) 240! . 60! (d) 300!
