a, Let q be the element of real numbers with q which is not equal to 0.

Show that if the absolute of q is less than 1, then

the limit of an absolute of q^n=0 as lim approaches positive infinity.

b, As the absolute of q which is greater than 1 then the

limit of an absolute of q^n =positive infinity as the limit approaches positive infinity.

c, What is the value of x if the sum of n=2 to positive infinity of (1+x)^-n=2