Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Project Euler: Problem 1, Multiples of 3 and 5
Project Euler: Problem 2, Sum of even Fibonacci
Project Euler: Problem 8, Find largest product in a large string of numbers
What is Sum Of all elements of Matrix
Derivative of polynomial
Altitude of locations on the earth
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