Answer:
Volume=length*wide*height
1st volume:1 ½*3*1=3/2×3=9/2 not equal
2nd volume: 2*2*1 ½=4*3/2=6units not equal
3rd volume: 1 ¼*4*1=5/4*4=5units equal
4th volume :2*1*2=4units not equal
third one is a required answer.
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