Write 'T' for true and 'F' for false for...

Write 'T' for true and 'F' for false for the statement given below:
a. 30, 40, 45, 60 are in proportion.
b. 6:8 and 9: 12 are equivalent ratios of 3 : 4.
c. a dozen : a score = 5:3.
d. 60 p : ₹ 3 = 1:5.

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