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.72Re^162 to.(z1)X^(A1)+ alpha particle ...

`._72Re^162 to._(z_1)X^(A_1)+` alpha particle
`._74W^(188)to._(Z_2)Y^(A_2)`+Beta particle
value of `(A_2-A_1)/(Z_2-Z_1)` is :

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