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. 1, 9, 25, 49, ?
Option 1: 83
Option 2: 91
Option 3: 81
Option 4: 73
Correct Answer: 81
Solution : Given: 1, 9, 25, 49, ?
The given numbers are the square of the odd numbers – 1→(1) 2 ; 9→(3) 2 ; 25→(5) 2 ; 49→(7) 2 The next odd number is 9 and its square is 81.
So, 81 is the missing number in the given series. Hence, the third option is correct.
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