TMUA Yotta Paper 1 · Question 14

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Yotta Paper 1 · Q14

Paper 1Number & counting

The digital root of a number is where you find the sum of the digits of a number, then find the sum of the answer, and repeat until you get a 1-digit number. For example, to find the digital root of $9678996$ you do $9+6+7+8+9+9+6=54$ , $5+4=9$ , so its digital root is $9$ . What's the digital root of $7^{3935}$ ?

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