A website Maths Puzzle

Q. Using the numerals 1,7,7,7 and 7 (a "1" and four "7"s) create the number 100.

As well as the five numerals you can use the usual mathematical operations +, -, x, / and brackets ().

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A website Other Question

Q. What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?
Q. The following equation is wrong: 101 - 102 = 1

Move one numeral to make it correct.