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Prove that if a is a natural number, then there exist two unequal natural numbers k and l for which ak − al is divisible by 10.
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Prove that if a is a natural number, then there exist two unequal natural numbers k and l for which ak − al is divisible by 10.

User Nassima
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1 Answer

6 votes
Take
k=11,l=1


ak-al=a(k-l)=10\cdot a
User Snels Nick
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