Need big hint to solve it. I have tried many times but failed.

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You are 16th in the leaderboard. But you cant solve this one

I think, Its basic combinatorics. Just remember Niloy would forget a thing and return to his house again then go to office. Now find out how many places are there where Niloy can forget and calculate each combination and lastly add them up. Its easssssyyyyyy…

I am not understanding the question.

Help me in this regard.

thanks i have solved it.