1.e = (a * (b +(c /(d * f))));
2. e = ((a * b) + (c / (d * f)));
3.e = ((a * b) + ((c / d)* f));
4.Both e = ((a * b) + (c / (d * f))); and e = ((a * b) + ((c / d)* f));
Answer:4