# A nucleus Az X has mass represented by m(A.Z). If mp and mn denote the mass of proton and neutron, respectively and BE the binding

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A nucleus $_Z^AX$ has mass represented by m(A.Z). If mp and mn denote the mass of proton and neutron, respectively and BE the binding energy (in MeV), then

(a) BE = [m(A,Z) - Zmp - (A - Z)mn]c2

(b) BE = [Zmp + (A - Z)mn - m(A,Z)]C2

(c) BE = [Zmp - Amn - m(A,Z)]C2

(d) BE = m(A,Z) - Zmp - (A - Z)mn

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Answer is (b) BE = [Zmp + (A - Z)mn - m(A,Z)]C2