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
Project Euler: Problem 6, Natural numbers, squares and sums.
Use of regexp
Who invented zero?
Distance walked 2D
chance in percent for minimum K heads when a good coin is tossed N times?
Multiply a column by a row
Given a number N, find the smallest prime P>N
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