Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 18, 36, 25, 50, 39, ?
Option 1: 72
Option 2: 76
Option 3: 74
Option 4: 78
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Correct Answer: 78
Solution : Given: 18, 36, 25, 50, 39, ?
The pattern is as follows – 18 × 2 = 36; 36 – 11 = 25; 25 × 2 = 50; 50 – 11 = 39; 39 × 2 = 78
So, the missing number is 78. Hence, the fourth option is correct.
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