3 ms·
13 * 28 = 364, pretty close, you are left with 1.25 as a remainder, so every 4 years have a 5 day leap week.
by zw123456 13y ago
13 * 28 = 364, pretty close, you are left with 1.25 as a remainder, so every 4 years have a 5 day leap week.
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