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In each of the following question, a series is given with one term missing. Find out the missing term from the given alternatives.
1, 3, 3, 6, 7, 9, ?, 12, 21
12
13
14
15
Clearly, the given sequence is a combination of two series: I. 1, 3, 7, ?, 21 and II. 3, 6, 9, 12 The pattern followed in (I) is +2, +4, … and the pattern followed in (II) is +3. So, missing number = 7 + 6 = 13.
By: MIRZA SADDAM HUSSAIN ProfileResourcesReport error
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