Preview:
// Opción 1:
function simpleMultiplication(n) {
    return n * (n % 2 ? 9 : 8);
}


// Opción 2:
function simpleMultiplication(n){
  return (n % 2 == 0) ? n * 8 : n * 9;
}


// Opción 3:
function simpleMultiplication(n){
    
  if(n % 2 === 0 ){ //si el numero es par...
	return n * 8;
  }
  else{ // si no lo es...
	return n * 9;
  }    
}
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