Mn and MP represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be

(a) M<NMn+ZMp          (b) M>NMn+ZMp
(c) M=NMn+ZMp          (d) M=NMn+Mp

(a) Actual mass of the nucleus is always less than total mass of nucleons so M<NMn+ZmP

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