A radioactive atom (Y)^(X) M emits tw...

A radioactive atom ` _(Y)^(X) M ` emits two `alpha ` particles and one ` beta ` particle successively. The number of neutrons in the nucleus of the product will be

` X - 4 - Y`

` X - Y - 5`

` X - Y -3`

` X - Y - 6`

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