A) 120
B) 135
C) 210
D) 520
Correct Answer: C
Solution :
[C] Consider cases when z=0, 1, 2,??, 11 \[\Rightarrow 34+31+28+.....+1\,\,(12\,\,times)\] \[=\frac{12}{3}(1+34)=210\]You need to login to perform this action.
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