Solution
Given : 13Δ3 = 20, 12Δ7 = 10 and 12Δ5 = 14
If we replace 'Δ' with '-', and multiply the difference by 2, we get the desired result.
Eg :- $$(13-3)\times2=20$$
and $$(12-7)\times2=10$$ and $$(12-5)\times2=14$$
Similarly, $$(16-2)\times2=28$$
=> Ans - (C)
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