Question : Directions: Which of the following four options will replace the question mark (?) in the following series? 48, 68, ?, 138, 188, 208
Option 1: 118
Option 2: 88
Option 3: 128
Option 4: 108
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Correct Answer: 118
Solution : Given: 48, 68, ?, 138, 188, 208
Add 20 and 50 alternatively to the previous numbers to obtain the next numbers of the series – 48 + 20 = 68; 68 + 50 = 118; 118 + 20 = 138; 138 + 50 = 188; 188 + 20 = 208
So, 118 is the missing number of the series. Hence, the first option is correct.
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