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hardest math problem-1

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Mohammad Salek Parvez:
After the solution of Fermat's Last Theorem , 3 math problems are ranked as the hardest. these are :
(1). Goldbach conjecture:
(2). P  vs  NP
(3). Riemann Hypothesis. 
Golbach Conjecture: every even number greater than 2 can be expressed as sum of two primes. It is  more than 250 years old. It has been neither proved nor disproved ( by means of a   counterexample) . Using super computers it has been verified up to  4000...... ( 18 zeroes)ред  but this means nothing for a mathematician.

Md.Shahjalal Talukder:
Thanks for sharing.

Shahrear.ns:
are these problems have any practicle use.... Sir

Md. Rasel Hossen:
Thanks for your significant information....... :)

ABM Nazmul Islam:
didn't find it hard as I am not a mathematician

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