Solution
Given : 9&4 = 50, 3&7 = -40 and 7&5 = 20
If we replace '&' with '-', and multiply the difference by 10, we get the desired result.
Eg :- $$(9-4)\times10=50$$
and $$(3-7)\times10=-40$$ and $$(7-5)\times10=20$$
Similarly, $$(4-5)\times10=-10$$
=> Ans - (B)
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