An element with atomic mass Z consists of two isotopes of mass number Z-1 and Z + 2. The percentage abundance of the heavier isotope is -

(A) 0.25

(B)33.3

(C)66.6

(D)75

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(B)  (Z-1)x + (Z+2) (100 – x) / 100

X = 200/3 ,  100-X = 100/3 = 33.3

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