I saw this question in an IQ test, but I have no idea after thinking for very long time.

  • 1
    $\begingroup$ Can you give the source of where this is from? $\endgroup$
    – Joe Kerr
    Jun 15 at 17:18
  • $\begingroup$ A friend sent me yesterday and he told me that it is from an IQ test online $\endgroup$
    – Sunny Tsoi
    Jun 16 at 17:12
  • $\begingroup$ @SunnyTsoi Please send the link. $\endgroup$ Jun 17 at 0:04

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