Three isotopes of an element have mass numbers, \( M \), \( (M+1) \) and \( (M+2) \). If the mea...

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Three isotopes of an element have mass numbers, \( M \), \( (M+1) \) and \( (M+2) \). If the mean mass number is \( (M+0.5) \), then which of the following ratios may be accepted for \( M \), \( (M+1),(M+2) \) in that order?
(a) \( 1: 1: 1 \)
(b) \( 4: 1: 1 \)
(c) \( 3: 2: 1 \)
(d) \( 2: 1: 1 \)
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