Question : Directions: In the following question, a series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series. 21, 26, 33, 42, 53, ?
Option 1: 56
Option 2: 63
Option 3: 66
Option 4: 69
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Correct Answer: 66
Solution : Given: 21, 26, 33, 42, 53, ?
Add consecutive odd numbers (starting from 5) to the previous number to get the next number of the series – 21 + 5 = 26; 26 + 7 = 33; 33 + 9 = 42; 42 + 11 = 53; 53 + 13 = 66
66 is the missing number. Hence, the third option is correct.
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