Today's Tuesday Test Time is alliterative, but don't let that throw you. Today's challenge might take you seconds or minutes, but most of you should be able to figure this one out. If not, don't fret; regular Brain Game visits are all you need to get your noggin back in tip-top shape. Good luck!

What's the missing letter in this sequence (and why)?

ST, N?, RD, TH...

Here is the SOLUTION.

THE SOLUTION:

The missing letter is D.

The letters are the ordinal suffixes of the first few numbers:

1ST, 2ND, 3RD, 4TH...

and the D in 2ND was the missing letter.

Thanks for playing!