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His famous phrase in class was “ Elementary Watson”.

Given:

$IRON$ = $5$ - $4$

$M$ = $6$ - $9$

Find the Missing Element M.

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Prof. Roman of the Chemistry dept. says

5 - 4 = five - IV → Fe, the symbol for iron.

so if M = 6 - 9 then

6 - 9 = six - IX → S, the symbol for sulphur.

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    $\begingroup$ Got it!!....... $\endgroup$ – Uvc Jun 10 '19 at 11:28
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    $\begingroup$ @Uvc - Roman might write the two elements before this answer as $6 - 10$ and $\pi - 1$ :P $\endgroup$ – Tom Jun 10 '19 at 11:48
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    $\begingroup$ Good one..we can be apprentices to Prof. Roman to learn his craft further. $\endgroup$ – Uvc Jun 10 '19 at 15:05

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