Question : Directions: What should come in place of x in the given series? 9, 13, 21, 33, 49, x
Option 1: 67
Option 2: 71
Option 3: 65
Option 4: 69
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Correct Answer: 69
Solution : Given: 9, 13, 21, 33, 49, x
Add the consecutive multiples of 4 to each term to obtain the next term – 9 + (4 × 1) = 9 + 4 = 13; 13 + (4 × 2) = 13 + 8 = 21; 21 + (4 × 3) = 21 + 12 = 33; 33 + (4 × 4) = 33 + 16 = 49; 49 + (4 × 5) = 49 + 20 = 69
So, 69 is the missing number in the series. Hence, the fourth option is correct.
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