What should b the missing number?

1, 2, 3, 5, 6, 7, ?, 12


1 Answer 1


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:

B1 Thiamine
B2 Riboflavin
B3 Niacin
B5 Pantothenic acid
B6 Pyridoxine
B7 Biotin
B9 Folate
B12 Cobalamins

B9 is missing in the original sequence.

  • $\begingroup$ Correct and well done on spotting the hints! $\endgroup$ Commented Oct 1, 2023 at 8:10
  • $\begingroup$ Personally I was surprised to learn that some of the original numbers were removed. $\endgroup$ Commented Oct 1, 2023 at 8:11

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