Series

Series questions in reasoning are basically of two types, Series completion (missing term, next term) and Series correction (finding the wrong element in the series).

Sample Problems

Question 1 : Find the missing term : 157.5, 45, 15, _, 3, 2, 2 Solution : Let the missing number be ‘n’ 157.5 / 45 = 3.5 45 / 15 = 3 15 / n = 2.5 n / 3 = 2 3 / 2 = 1.5 2 / 2 = 1 Therefore, the missing number is 6.   Question 2 : Find the next term in the series : 6, 7, 9, 13, _ Solution : Let the missing number be ‘n’ 7 – 6 = 1 9 – 7 = 2 13 – 9 = 4 n – 13 = 8 Therefore, next number in the series = n = 21   Question 3 : Find the incorrect element in the series : 1, 3, 10, 36, 152, 760, 4632 Solution : 1 x 1 + 2 = 3 3 x 2 + 4 = 10 10 x 3 + 6 = 36 36 x 4 + 8 = 152 152 x 5 + 10 = 770 770 x 6 + 12 = 4632 Therefore, the incorrect element in the series is 760.   This article has been contributed by Nishant Arora   Please write comments if you have any doubts related to the topic discussed above, or if you are facing difficulty in any question or if you would like to discuss a question other than those mentioned above.   Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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