The 3-a-day calcium rule is:
You have to eat or drink 3 portions of dairy products a day. For example cheese, yogurt and milk.
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3-6 seconds rule = -3
The DRI for calcium is 1000 milligrams per day for normal individuals.
Calcium's valency is 2. neither 3 nor 5, actually the difference of the two; that is 2.
The 3 times circle rule is a rule for finding the circumfrence of a circle. Basiclly, you multiply the diameter by 3.
It is 3 6 9