Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 43, 51, 78, 142, 267, ?
Option 1: 483
Option 2: 473
Option 3: 463
Option 4: 493
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Correct Answer: 483
Solution : Given: 43, 51, 78, 142, 267, ?
Add cubes of the natural numbers starting from 2 to the previous numbers, to get the next number of the series – 43 + 2 3 = 43 + 8 = 51 51 + 3 3 = 51 + 27 = 78 78 + 4 3 = 78 + 64 = 142 142 + 5 3 = 142 + 125 = 267 267 + 6 3 = 267 + 216 = 483
So, 483 is the missing number. Hence, the first option is correct.
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