Others Maths Puzzle Logical Reasoning

Gopal is climbing the stairs. He can jump 1 or 2 or 3 steps at a time. He wants to climb N steps. In how many ways can he reach the Nth step?

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Others Other Question
evaluate log0.003 if log3=0.4771 123456789 changed into 987654321 using +,-,*,/
each operator twice alone.