A flight of stairs has 6 steps. David can go up for 1 step, 2 steps or 3 steps each time. How many ways is/are there for David to go up the stairs? - Quora
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The first of six flights of stairs and no lift (not the main part of the hotel ) - Picture of Comfort Inn Kings Cross, London - Tripadvisor
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What Is a Flight of Stairs | Types of Stairs | How Many Stairs in a Flight | Some Facts About Stairwells
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Frontiers | Brief Vigorous Stair Climbing Effectively Improves Cardiorespiratory Fitness in Patients With Coronary Artery Disease: A Randomized Trial
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