In the place of "Find the sum of all products whose...", I would say: "Find the number of all products whose..." ;-)
Why  instead of 0?
Since I have kludged a solution together, can I have a hint?
this solution works on my comupter
I see the first test command line is corrupted
:( :( :(
I've fixed that first line in the test suite. Try it again.
Determine whether a vector is monotonically increasing
Find all elements less than 0 or greater than 10 and replace them with NaN
How many Fibonacci numbers?
Crop an Image
Find Missing Number
I want to know everything!
Numbers spiral diagonals (Part 2)
Rank of magic square (for beginners)
BLOCK x3 (Version 1)
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