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functionsuperDigit(n,k){// Write your code hereletres=getSuperDigit(n)*kreturnString(res).length!=1?getSuperDigit(res):res}functiongetSuperDigit(n){letsd=nwhile(String(sd).length!=1){sd=String(sd).split('').reduce((a,b)=>Number(a)+Number(b))}returnsd}
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Recursive Digit Sum
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Javascript solution: