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Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
21, 23, 20, 22, 19, 21, ?

Option 1: 17

Option 2: 18

Option 3: 23

Option 4: 22


Team Careers360 14th Jan, 2024
Answer (1)
Team Careers360 15th Jan, 2024

Correct Answer: 18


Solution : Given:
21, 23, 20, 22, 19, 21, ?

In the above-given series, add 2 and subtract 3 alternately to each number to obtain the next number.
21 + 2 = 23; 23 – 3 = 20; 20 + 2 = 22; 22 – 3 = 19; 19 + 2 =21; 21 – 3 = 18

So, the missing number is 18. Hence, the second option is correct.

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