A) 84
B) 83
C) 85
D) 94
Correct Answer: B
Solution :
The rule is: \[a\,b={{a}^{2}}-1.\,{{b}^{2}}-1\] \[43={{4}^{2}}-{{1.3}^{2}}-1=158;\] \[35={{3}^{2}}-{{1.5}^{2}}-1=824\] \[42={{4}^{2}}-{{1.2}^{2}}-1=153\] \[\therefore \] \[31={{3}^{2}}-{{1.2}^{2}}-1=83\]
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