mathschallenge.net logo

Finishing With 99

Problem

Consider the following results.

991 = 99
992 = 9801
993 = 970299
994 = 96059601
995 = 9509900499

Prove that 99n ends in 99 for odd n.

Problem ID: 141 (Dec 2003)     Difficulty: 4 Star

Show Problem & Solution