Amitava, can you please be a little more specific than "mentioned earlier"? Remember, you can put links into your description with notation.
corrected. thanks, Ned.
struggled with this one :) Hint :monte carlo algorthim approach
Sums with Excluded Digits
Distance walked 3D
High school cafeteria
Back to basics 9 - Indexed References
Back to basics 19 - character types
Size of this cup?
How many palindromes?
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