| Direction: What should come in place of question mark (?) in the following number series? | |||||
| 9 | 10 | 22 | ? | 280 | 1405 |
A) 79
B) 89
C) 49
D) 37
E) 69
Correct Answer: E
Solution :
The series is\[9\times 1+1=10\], \[10\times 2+2=22,\,\,22\times 3+3=\mathbf{69}\], \[69\times 4+4=280,\,\,280\times 5+5=1405,...\]
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