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A. 1:2

B. 3:5

C. 1:3

**D. 3:4**

72 should be divisible by addition of the above ratio.

Using trial and error method

For (a): – 1+2 = 3, 72 is divisible by 3

For (b): – 3+5 = 8, 72 is divisible by 8

For (a): – 1+3 = 4, 72 is divisible by 4

For (a): – 3+4 = 7, 72 is not divisible by 7

Therefore, the answer is option (d)

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