| 3 | 8 | 10 | 2 | ? | 1 |
| 6 | 56 | 90 | 2 | 20 | 0 |
A) 0
B) 3
C) 5
D) 7
Correct Answer: C
Solution :
Suppose X denotes the numbers in the first row and Y denotes the numbers in the second row. Then, the pattern is \[{{X}^{2}}-X=Y.\] Clearly, \[{{3}^{2}}-3=9-3=6;\] \[{{8}^{2}}-8=64-8=56;\] \[{{10}^{2}}-10=100-10=90;\] \[{{2}^{2}}-2=4-2=2;\] \[{{1}^{2}}-1=1-1=0.\] Similarly, \[{{5}^{2}}-5=20.\] So, the missing number is 5.
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