A) 156
B) 240
C) 272
D) 342
Correct Answer: C
Solution :
Clearly, \[\text{21}0={{\left( \text{15} \right)}^{\text{2}}}-\text{15}\]and \[\text{38}0={{\left( \text{15}+\text{5} \right)}^{\text{2}}}-\left( \text{15}+\text{5} \right)\] Now, \[\text{182}={{\left( \text{13} \right)}^{\text{2}}}+\text{13}\] and \[{{\left( \text{13}+\text{3} \right)}^{\text{2}}}+\left( \text{13}+\text{3} \right)=\text{272}\]
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