Question : Directions: Which number will replace the question mark (?) in the following series? 3, 12, 52, 159, 640, ?
Option 1: 1910
Option 2: 1731
Option 3: 1863
Option 4: 1923
Correct Answer: 1923
Solution : Given: 3, 12, 52, 159, 640, ?
Multiply and add 3 and 4 alternatively in each number to get the required missing number in the series – 3 × 3 + 3 = 9 + 3 = 12, 12 × 4 + 4 = 48 + 4 = 52, 52 × 3 + 3 = 156 + 3 = 159, 159 × 4 + 4 = 636 + 4 = 640, 640 × 3 + 3 = 1920 + 3 = 1923
So, 1923 is the required missing term in the series. Hence, the fourth option is correct.
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