The rule for divisibility by numbers ending in 3
The rule for divisibility by tables of numbers ending in 3
The first way
*It's the same by {3,13,23,33,43,53,63,73...}
The second way
**It's the same by {3,13,23,33,43,53,63,73...}
The rule for divisibility by tables of numbers ending in 3
The first way
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