Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
–4, –1, 4, ?, 20, 31, 44
Option 1: 15
Option 2: 17
Option 3: 11
Option 4: 18
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Correct Answer: 11
Solution :
Given:
–4, –1, 4, ?, 20, 31, 44
Add consecutive odd numbers in the previous term to obtain the next term.
–4 + 3 = –1; –1 + 5 = 4; 4 + 7 = 11; 11 + 9 = 20; 20 + 11 = 31; 31 + 13 = 44
So, 11 is the missing term in the series. Hence, the third option is correct.
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