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An element is found in nature in two iso...

An element is found in nature in two isotopic forms with mass numbers (A-1) and (A+3). If the average atomic mass of the element is found to be A, then the relative abundance of the heavier isotope in the nature will be :

A

`66.6%`

B

`75%`

C

`25%`

D

`33.3%`

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