Wednesday, 22 June 2011

how to find a number is prime or not ?


1. To check whether a number p is prime or not

Find a whole number nearly greater than square root of p.

Let k> root P.

Test whether P is divisible by any prime number less than k.
If yes,then P is not prime.Otherwise p is prime.

2. Two Numbers are said to be co-primes if their H.C.F is 1.

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