With each digit having only 2 possibilities, the answer is 2 to the 4th power, which is 16. The 4 is because there are 4 digits. Think about the binary numbers 0000 to 1111, there are 2 possibilities for each digit. If your constraint is that the digits must have at least one 2 and at least one 5, then eliminate the two combinations 2222 and 5555, and that answer would be 14.
2+3+9=14 9+_+8=17+8=25 25-14=11
4,500,000,000
all you do as a fration it is 2/3 then all you do is divide 3 into 2 which will be 1 r.1
write 4.5 in fractional form
It is: 4(x+y+z)
24.
18
874321 is the largest number made from all these digits.
There are 3*2*1 = 6 of them.
Write "0.8", followed by any digit or digits. Include at least one non-zero digit.
468, 486, 648, 684, 846, 864.
The answer is 3*3*2*1 = 18. If the leading digit is 0 it is not a 4-digit number.
9
Oh, dude, I mean, like, there are 4 digits in 1230, right? So you can totally make 4-digit numbers by using each of those digits once. That's like, 4 factorial, which is 24. So, you can totally write 24 different four-digit numbers using 1230 without repeating any digit. Easy peasy!
For each number, there are four digits, and for each digit, there are two possibilities for digits: 3 or 4. So the number of 4-digit numbers is 2*2*2*2 = 16. The 4-digit numbers using 3 and 4 are: 3333 3334 3343 3344 3433 3434 3443 3444 4333 4334 4343 4344 4433 4434 4443 4444
234, 243, 324, 342, 423, and 432.
648