What should b the missing number?
1, 2, 3, 5, 6, 7, ?, 12
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The missing number is:
Because these numbers are those which are also...
B vitamins when prefixed with 'B'! This explains the 'healthy' title (vitamins are needed for good health) and the use of 'b' rather than 'be' in the text (it's a hint, not a typo!).
The B vitamins are:
B5 Pantothenic acid
B9 is missing in the original sequence.