Question : Directions: Which number should replace the question mark (?) in the following number series? 642, 598, 554, ?, 466, 422
Option 1: 514
Option 2: 524
Option 3: 500
Option 4: 510
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Correct Answer: 510
Solution : Given: 642, 598, 554, ?, 466, 422
Let's apply the pattern – 642 – 44 = 598; 598 – 44 = 554; 554 – 44 = 510; 510 – 44 = 466; 466 – 44 = 422
So, 510 is the missing number in the series. Hence, the fourth option is correct.
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