| Directions for Questions - The numbers have been arranged under some rule. Based on that rule which number best fits the question mark? |
A) 278
B) 428
C) 628
D) 728
Correct Answer: D
Solution :
The logic is \[{{3}^{n}}\text{+}1\]or \[-1\] according as n is or \[\therefore \,\,?={{3}^{6}}-1=729-1=728\]
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