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A person is standing on the floor and wants to climb to the second floor using a staircase with 17 steps. Knowing that each step covers either 1 or 2 steps, and the number of steps must always be an integer, how many ways can this person climb all 17 steps of the staircase? (Math 10 - Permutations and Repetitions in Counting)
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How many 6-digit natural numbers satisfy the condition: the sum of their digits is less than 4
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Knowing that each step taken is either 20cm or 30cm and the number of steps must always be an int...
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