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Two pairs of statements p and q are give...

Two pairs of statements p and q are given below . Combine theses two statements using the biconditional phrase "if and only if " .
p : If the sum of digits in a positive integer n is divisible by 9 , then the number is divisibel by 9
q : If a positive integer n is divisible by 9 , then the sum of the digits in n is divisible by 9 .

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