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Series

5. A set of n...

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

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B

(b) I and II only

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C

(c) II and III only

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D

(d) I, II, and III

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Solution

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).

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