Question

5. A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?
I. 3 II. 1 III. 5

• A. (a) II only
• B. (b) I and II only
• C. (c) II and III only
• D. (d) I, II, and III

Answer 1

The correct option is D (d) I, II, and III

Ans: (d)

Sol: Series property: t =>t+2. Note: for any given number N, ONLY N + 2 is compulsory. N - 2 is not a necessity as N could be the first term. Given: -1 belongs to the series. Hence 1, 3, 5 too belong to the series. Hence, (d).