**Concept: The question tests on the ability to solve questions on Probability**

**Solution:**

Probability = Favourable Outcomes / Total Outcomes

Total Outcomes = choosing 3 discs out of 5 = 5C3 = 10

Number of possible outcomes when the sum on the 3 discs is > 10 = (2,4,5) and (3,4,5) = 2

The required probability = 2/10 = 1/5**Option E**