Try to explain that 523-521 can be divided by 120

Because 523-521 = 521 × 52-521 = 521 (52-1) = 521 × 24 = 520 × 120, 523-521 can be divided by 120

Try to explain that 523-521 can be divided by 120

Because 523-521 = 521 × 52-521 = 521 (52-1) = 521 × 24 = 520 × 120, 523-521 can be divided by 120

Can 5 ^ 23-5 ^ 21 be divided by 120? Why?

Can 5 ^ 23-5 ^ 21 be divided by 120? Why?
5^23-5^21 = 5^21 ( 25 - 1 ) = 5 ^ 20 x 5 x 24 = 120 x 5^20
It's divisible

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