how to test the divisibility by 7
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In mathematics, a function is a binary relation between two sets that associates each element of the first set to exactly one element of the second set. Typical examples are functions from integers to integers, or from the real numbers to real numbers.
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Let us take à example 343 to check divisíbility by 7.
343 = multiply last digit by 2 we get 3×2 = 6 , subtract 6 from remaining number is 34 - 6 = 28 .
which is divisible by 7 , then 343 is also divisible by 7.
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