Solution
Resulted number = (second digit+third digit) - first digit
246 ==> (4+6)-2 = 10-2 = 8
624 ==> (2+4)-6 = 6-6 = 0
327 ==> (2+7)-3 = 9-3 = 6
423 ==> (2+3)-4 = 5-4 = 1
Hence 1 will come in place of question mark.
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