If $space space straight C presuperscript 10 subscript straight r space equals space straight C presuperscript 10 subscript 2 comma$ find the values of r.

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Solution

straight C presuperscript 10 subscript straight r space equals space straight C presuperscript 10 subscript 2

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r = 2

Also,

straight C presuperscript 10 subscript straight r space equals space straight C presuperscript 10 subscript 2 space equals space straight C presuperscript 10 subscript 10 minus 2 end subscript

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straight C presuperscript 10 subscript straight r space equals space straight C presuperscript 10 subscript 8

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r = 8
Hence, r = 2 or 8

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