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Question

If a:b=2:3 and b:c=4:5 is then a2:b2:bc is

A
4:9:45
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B
16:36:20
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C
16:36:45
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D
45:36:20
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Solution

The correct option is C 16:36:45
Given

a:b=2:3 and b:c=4:5

a=23b and c=54b

a2=49b2 and bc=54b2

a2:b2:bc=49:1:54

a2:b2:bc=16:36:45

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