A) 21
B) 12
C) 15
D) 10
E) None of these
Correct Answer: B
Solution :
Explanation Option [b] is correct. The series is as follows: \[{{4}^{2}}+4=20\] \[{{5}^{2}}+5=30\] \[{{2}^{2}}+2=6\] Similarly, \[{{3}^{2}}+3=12\]
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