1) A big cube of side 6 cm is formed by putting together 216 small but identical cubes each of side 1 cm. now, if the corner cubes are removed, what is the change in total surface area of the big cube?
a) decrease by 4 sq.cm
b) decrease by 12 sq.cm
c) increase by 48 sq.cm
e) remains same how?
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. What is the sum of all the even integers between 99 and 301?
A. 10,100
B. 20,200
C. 22,650
D. 40,200
E. 45,150