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in how many ways can letter of the set [q r s t] be arranged to form ordered codes of 2 letters.[no. letters are repeated]
in how many ways can letter of the set [q r s t] be arranged to form ordered codes of 2 letters.[no. letters are repeated]
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Answer:
4x3 = 12 ways
Proof:
list all possible pairs,
qr qs qt
rq rs rt
sq sr st
tq tr ts