If $0,1,2,\dots,7,8,9$ are coded as $O,P,Q,\dots,V,W,X$, then $45$ will be coded as  ______.

1. $TS$
2. $ST$
3. $SS$
4. $SU$

Given that, $0 = O,1 = P,2 = Q,3 = R,4 = S,5 = T,6 = U, \ldots$

$\therefore 45$ we can be coded as $ST.$

So, the correct answer is $(B).$
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$0 → O$

$1 → P$

$2 → Q$

$3 → R$

$4 → S$

$5 → T$

.

.

So, $45 → ST$

Hence Option B is correct.

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