Which expression is equivalent to 2*3 / 2^6
A 2^2
B 1/2^2
C 2^8
D 1/2^8

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)