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Neporo4naja [7]
4 years ago
3

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.

Mathematics
1 answer:
stellarik [79]4 years ago
8 0
Take k=11,l=1

ak-al=a(k-l)=10\cdot a
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~~~ 20 POINTS ~~~
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A) Lets write our equations.

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144
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