Bunuel wrote:

Set A consists of five unique prime numbers. Which of the following values, if added as a sixth term to Set A, must increase the range of Set A?

I. 0

II. 1

III. 100

A. I only

B. II only

C. III only

D. I and II only

E. II and III only

Tricky question.

Set A consists of five unique prime numbers.

Lowest possible element of the set could be 2. Highest possible element could be any large prime number.

To increase the range " Difference between the largest and smallest element of the set" : we need to either lower the lowest element or increase the largest one.

Hence adding either 0 or 1 to the set

will surely increase it's range by at least 2 or 1 respectively.

We cannot say the same thing about 100, as the largest prime number already existing in the set could be larger than 100.

Hence

Option (D) is our answer.

+1 Kudos if you liked the explanation

Best,

Gladi