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OpenStudy (anonymous):
is 13^n+10 divisible by 2 and is 7^n+11 divisible by 4??
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OpenStudy (anonymous):
13^n=(12+1)^n expand it. what do you get?
OpenStudy (anonymous):
is there a formula i can use?
OpenStudy (anonymous):
you can expand (12+1)^n with the help of binomial expansion.
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