test the divisibility of 465 by 15
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if the number is divisible by 3 and 5 it is divisible by 15
since the last digit is 5 it is divisible by 5
divisibility of 3 can be tested by adding all the digits of the number and checking if it is divisible by 3
4+6+5 = 15 which is divisible by 3
since 465 is divisible bye 3 and 5 it is divisible 15
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