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A radioactive nucleus undergoes a series...

A radioactive nucleus undergoes a series of decays according to the sequence
`Xoverset(beta)toX_(1)overset(alpha)toX_(2)overset(alpha)toX_(3)`.
f the mass number and atomic number of `X_(3)` are 172 and 69 respectively. what is the mass numberand atomic number of X ?

A

180,72

B

180,74

C

176,72

D

170,70

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A
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