Question
Which one of the following is the common factor of (`47^43` + `43^43`) and (`47^47` + `43^47`) ?
Answer: Option B
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When n is odd, (`x^n` +` a^n`) is always divisible by (`x` + a ).
`therefore` Each one of (`47^43` + `43^43`) and (`47^47` + ` 43^47`) is divisible by (47 + 43) .
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