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 column containing 1 cube. \[\therefore \]Total number of cubes \[=(\text{9}\times \text{5})+(\text{7}\times \text{4})+(\text{5}\times \text{3})+(\text{1}\times \text{1})=\text{89}\]
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