Three circles are mutually tangent to each other and also to a line.
find the radius of the smallest circle. The radius of the other two is given.
Sum all integers from 1 to 2^n
Back to basics 20 - singleton dimensions
Set a diagonal
Unique values without using UNIQUE function
Is it an Armstrong number?
find nth even fibonacci number
Sieve of Eratosthenes - 02
find subscripts from linear index
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