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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Which number produces a rationale number when multiplied by 1/5

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)