Question 443699
When you pick the first card, you have 4 possibilities.
For the second, you have 3 possibilities.
For the third, you have 2 possibilities.
4*3*2 = 24
There are 24 ways to arrange the 3 cards drawn from 4

ARS
ART
ASR
AST
ATR
ATS

TAR
TAS
TRA
TRS
TSA
TSR

RAS
RAT
RTA
RTS
RSA
RST

SAT
SAR
STA
STR
SRA
SRT

Done.