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Strings are basically "words in computers". As an ordered set of characters, these are the building blocks that allow us to do things from searching filesystems to decrypting ciphers.
How many times does the number '7' appear in String a?
1 

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Count the total number of letter "F" in the following text:
FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS...
This teaser is called "Alzheimer's' eye test".
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Consider the calculation as follows :
\[ \frac{2(X+3)} {Y+9} \] (where X & Y are variables)
Which of the following represents the correct Reverse Polish notation for that calculation :
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