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Mathematics, 25.11.2019 23:31 melodeelathrom

An elf has a staircase of n stairs to climb. each step it takes can cover either one stair or two stairs. find a recurrence relation for a_n, the number of different ways for the elf to ascend the n-stair staircase. find a recurrence relation for the number or ways the elf in example 2 can climb n stairs if each step covers either one or two or three stairs? how many ways are there for the elf to climb four stairs?

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