PINNED

A typical PIN (personal identification number) is a sequence of any four symbols chosen from the 26 letters in the alphabet and the ten digits.If all PINs are equally likely,what is the probability that a randomly chosen PIN contains a repeated symbol?

If FLOTSAM is coded as UOLGHZN, then how will PIN be coded as ?

When was the PIN Code (Postal Index Code) introduced in India?

Statements: No clips is a pin. All badges are pins Conclusions: I. No badge is a clip II. All pins are badges.