Let n be a positive integer
prove that n is divisible by 5 if and only if it ends with 0,5
prove than n is divisible by 11 if and only if the alternating sum of
its digits is divisible by 11
find a similar criterion for divisibility by 7 and prove it .
Mathematics Homework Solutions
#83529
Divisibility Tests and Rules and Quotient Polynomials
Let n be a positive integer
a) prove that n is divisible by 5 if and only if it ends with 0,5
b) prove than n is divisible by 11 if and only if the alternating sum of its digits is divisible by 11
c) find a similar criterion for divisibility by 7 and prove it .
Divisibility Tests and Rules and Quotient Polynomials are investigated.
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