Math Topics that I probably will never use:

How many 3's are in 12? How many 3's in ZERO? How many 0's in 6? How many 0's in ZERO? 1/2  ,  1/4  ,  1/8,  1/16,  ...  1/ N  as N gets bigger and bigger and... N approaches infinity and  the SEQUENCE approaches ZERO, but the SUM is 1 But 1/2 , 1/3, 1/4, 1/5,  ... Zero  Sum is infinite 9/10 + 9/100 + 9/1000 + ...  = ?