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.
Remove all the consonants
Alphabetize by last name
Basic electricity in a dry situation
Getting logical indexes
Expression or variable?
Generalised Hamming Number
Numbers spiral diagonals (Part 1)
Chess ELO rating system
What is the scope of variables in Matlab ?
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