The sum of digits of the second number is subtracted from the sum of digits of first number. Eg = $$(6+4)-(1+4)=10-5=5$$ and $$(9+2)-(3+1)=11-4=7$$ and $$(2+6)-(1+1)=8-2=6$$ Similarly, $$(5+6)-(2+2)=11-4=7$$ => Ans - (B)
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