Question : Directions: Which number should replace the question mark (?) in the following number series?
39, 42, 48, 57, 69, ?, 102
Option 1: 87
Option 2: 79
Option 3: 81
Option 4: 84
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Correct Answer: 84
Solution :
Given:
39, 42, 48, 57, 69, ?, 102
Add consecutive multiples of 3 in the series to get the next term.
39 + 3 = 42, 42 + 6 = 48, 48 + 9 = 57, 57 + 12 = 69, 69 + 15 = 84, 84 + 18 = 102
So, the required missing term is 84. Hence, the fourth option is correct.
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