Three of the following four number-pairs are alike in a certain way and one is different. Identify the different one.
16:36 means $$4^2:6^2$$
25:49 means $$5^2:7^2$$
48:81 means $$4^2\times 3:9^2$$
64:100 means $$8^2:10^2$$
So, C is correct.
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