In the following question select the missing number from the given series 1 7 3 9 6 12 10 16 15 ........

Logical Reasoning (CPO) Number series

In the following question, select the missing number from the given series.

1, 7, 3, 9, 6, 12, 10, 16, 15, ?

- The series alternates between adding 2 and 4 to each number:

- Start with 1 ? add 6 ? 7

- Then decrease 4 ? 3 ? add 6 ? 9

- Then decrease 3 ? 6 ? add 6 ? 12

- Then decrease 2 ? 10 ? add 6 ? 16

- Then decrease 1 ? 15

- Now the pattern indicates the need to add 6 to the last number:

- 15 + 6 = 21

- The steps show an alternating pattern of increasing and decreasing.

- The correct number that completes this series is 21.

- Option:1 - 18: Incorrect, as 15 + 3 = 18

- Option:2 - 12: Incorrect, as 12 does not fit the pattern

- Option:3 - 20: Incorrect, as it doesn't follow the addition of 6

- *Option:4, 21: Correct answer*

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