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A radiactive nucleus 'A' undergoes a ser...

A radiactive nucleus `'A'` undergoes a series of decays according to the following scheme:
`Aoverset(alpha)rarrA_(1)overset(beta)rarrA_(2)overset(alpha)rarrA_(3)overset(y)rarrA_(4)`
The mass number and atomic number `A` are `180` and `72` respectively. What are these number for `A_(4)`?

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`""_(72)A^(180) overset(alpha)to A_(1)^(176) overset(beta)to ""_(71)A_(2)^(176) overset(alpha)to ""_(69)A_(3)^(172) overset(gamma)to ""_(69)A_(4)^(172)`
The atomic number and mass number for `A_(4)` are 69 and 172, respectively.
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