A) 80
B) 87
C) 89
D) 90
Correct Answer: C
Solution :
In the figure, there are 9 columns containing 5 cubes each, 7 columns containing 4 cubes each, 5 columns containing 3 cubes each and 1 columns containing 1 cube. \[\therefore \]Total number of cubes \[=(9\times 5)+(7\times 4)+(5\times 3)+(1\times 1)=89\].
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