gre study

it is a comparison ques

thanx. i didnt think that its the product of the nos. thanx again

thanx u r gr8.

col A the least positive integer with 4 different prime factors each greater than 2 col B 1155

thanx a lot

if n is an integer and 99 ans 10 plz explain this.

is there any short method to solve this.?

plz solve this for me 1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10