1
2 is prime, its only factors are one and itself.
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.
875
92.
The greatest 2-digit even number is 98
Since the greatest digit is 9 and the greatest 2-digit number is 99, the product of them is 891.
The greatest sommon factor of 10 -2 and 14 is 2.
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
Just arrange all numbers from highest to lowest, from left to right.So it would be:7532
There is no such number. If N were the greatest even number then N+2 would be a greater even number. So N could not be the greatest even number.
The greatest factor of any number is the number itself. The greatest common factor of 6, 16 and 30 is 2.
The smallest is 10 and the greatest is 99.