It depends upon the digit placement. 7 can have different values as follows:
777
First 7 = 700
Second 7 = 70
Third 7 = 7
I found it elsewhere on the web - my 8 year old 3rd grader, her after school tutors and I couldn't figure it out so I googled it.
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Number 7 has only one digit so it has only place value also.
7 in 7152 represents 7000 but 7 in 3725 represents 700
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.
56 combinations. :)