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how i can solve it by using geometric sequence
Start: 81 cm
After 1 bounce: 81*2/3 = 54 cm
After 2 bounces: 81*(2/3)2 = 36 cm
After 3 bounces: 81*(2/3)3 = 24 cm
After 4 bounces: 81*(2/3)4 = 16 cm