There are 5 numbers which can make the 3 digit numbers in this example.
Therefore each digit in the 3 digit number has 5 choices of which number can be placed there.
Therefore number of 3 digit numbers = 5 x 5 x 5 = 125
Using 1, 2, and 3, you can make 27 whole numbers.
7^2=49
No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
18.You can answer it easily by considering three places for three digits of the number.The hundreds place cannot take zero hence it can take 2 values.The next two places can take all the three digits.Hence the total number of ways is 2*3*3=18.
1124 1224 1244
111,112,121,211,122,212,221,222,113,131,311,133,313,331,333,223,232,322,233,323,332,123, 132, 213, 231, 312, 321
2 is prime, its only factors are one and itself.
Using 1, 2, and 3, you can make 27 whole numbers.
eight
8 of them.
7^2=49
No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
there are 22
18.You can answer it easily by considering three places for three digits of the number.The hundreds place cannot take zero hence it can take 2 values.The next two places can take all the three digits.Hence the total number of ways is 2*3*3=18.
6, if you don't repeat any numbers.
24
1124 1224 1244