exam Maths Puzzle Numerical Ability

Imagine making a 6 digit number where each digit can only be zero or one. Explain why there are only 64 such numbers.

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Tutor can you help me please???This is from my textbook (Penner and Better)For the one to one functon f(x)= 2/3-x

Find the inverse f^-1; find the domain and range of f; Find the domain and range of f^-1 You pay $38.50 for a sweater that is marked 30% off the reguar price. What is the regular price of the sweater? How much did you save by buying it on sale?