Prime factors

the largest two digit prime factor of 200C100 is ...

first look at the larget 2 digit prime (97?)

now see if this is a factor of 200C100?

no it is not..

so what could our best bet be.. a number close to 200/3?? (why?)

so look at 61

That should give you some hint or the answer :)

Yes why? ;)

because any prime number greater than 100/3 will appear twice in the numerator and in the denominator.. (why?)