Solution
In each number, the first digit is subtracted from the sum of last two digits.
Eg : $$879=(7+9)-8=16-8=8$$
and $$625=(2+5)-6=7-6=1$$
and $$586=(8+6)-5=14-5=9$$
Similarly, $$785=(8+5)-7=13-7=6$$
=> Ans - (A)
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