thread is regarding the various new shortcuts and concepts we come across while preparing for quants
please do upload wateva u come across...
These may appear simple or abvious but wen u know it, itz realy helpful wen solving tricky questions..
for example: find the sum of no. of factors of these numbers:
it may take tym to find the number of factors of these numbers and then add them up..
if u know the very simple concept or even once heard of it or encountered at a thread at Pagalguy, then u can solve it within 5 sec:
CONCEPT: A no. which is a square of a prime no. has only 3 factors.
So the answer is 3*5 that is 15...
so guyz , its a request please share such concepts, no matter how simple they are..