# Complete the series by replacing "?" with the correct letters: ST, ND, RD, TH, ?

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posted May 18

## 1 Solution

Answer is ST, ND, RD, TH, "TH".
The logic behind is: Displayed the series of Ordinal number suffixes.
Ordinal number series of {1,2,3,4,5} is {First, Second, Third, Fourth, Fifth }
{First, Second, Third, Fourth, Fifth } equals { 1st,2nd,3rd,4th,5th}
Suffixes of {1st,2nd,3rd,4th,5th} is {st,nd,rd,th,th}

solution May 18

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+1 vote

Please complete the pyramid by replacing '?' with the correct number?

``````1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
``````