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jmc

number theory junior

Problem

Convert

13 5_{7}

to a base 10 integer.

Solution — click to reveal

13 5_{7} = 1 \cdot 7^{2} + 3 \cdot 7^{1} + 5 \cdot 7^{0} = 49 + 21 + 5 = 75 .

Final answer

75

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