Directions (Q1 – 5): In each of the following questions, a number series is established if the positions of two number series test out of the five marked numbers are interchanged. the position of the first unmarked number remains the same and it is the beginning of the series. The earlier of the two marked numbers whose positions are interchanged is the answer. For example, if an interchanged of the number marked 1 and the number marked 4 is required to establish the series, your answer is 1. If it is not necessary to interchanged to position of the numbers to establish the series give 5 as your answer. Remember that when the series is established, the number change from left to right (i.e from the unmarked number to the last marked number) in a specific order.

**Practice Exercise - 231 [ Number Series ]**

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