Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? –15, –9, –3, 3, 9, 15, ?
Option 1: 24
Option 2: 30
Option 3: 21
Option 4: 18
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Correct Answer: 21
Solution : Given: –15, –9, –3, 3, 9, 15, ?
In the above-given series, add 6 to the previous number to obtain the next number. –15 + 6 = –9; –9 + 6 = –3; –3 + 6 = 3; 3 + 6 = 9; 9 + 6 = 15; 15 + 6 = 21
So, the missing number of the series is 21. Hence, the third option is correct.
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