Question : Directions: From the given options, choose the correct one that will replace the question mark (?) in the following series.
1, 5, 3, 2, 10, 6, 4, 15, 9, 8, ?, 12
Option 1: 20
Option 2: 19
Option 3: 15
Option 4: 18
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Correct Answer: 20
Solution :
Given:
1, 5, 3, 2, 10, 6, 4, 15, 9, 8, ?, 12
Multiply the number by 2 and add 5 and 3 as shown, to obtain the required missing number –
Therefore, the required missing number in the series is 20. Hence, the first option is correct.
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