9 is the only one that isn't prime.
The factors of 3 are 1 and 3 and the factors of 5 are 1 and 5
1, because all the numbers are factors of 5.* * * * *Or 5: it is the only prime number.Or 15: it is the only number that is not a factor of 100Or 25: it is the only number with three factorsOr 100: it is the only number with 9 factors
The factors of 3 are: 1, 3 The factors of 5 are: 1, 5 The factors of 9 are: 1, 3, 9 The factors of 15 are: 1, 3, 5, 15
The factors of 3 are: 1, 3 The factors of 5 are: 1, 5 The factors of 10 are: 1, 2, 5, 10
factors of 3: 1, 3 factors of 5: 1, 5 factors of 97: 1, 97
The Prime Factors of 15 are 3, 5
23 doesnot belong because it is a primenumber. Its factors are 1 and itself only.34 and 45 are compositenumbers. Their factors aside from 1 and themselves are:34 = 2, 1745 = 3, 5, 9, 15,
Factors of 81 are [3 3 3 3] Factors of 75 are [3 5 5] Common factors [3] ■
225=3x75=32x25=32x5x5=32x52 prime factors are 3 and 5.The proper prime factors of 225 are 3, 3, 5, 5.The proper prime factors of 225 are 3, 3, 5, 5.
Prime factors of 15 are 3 and 5.
The prime factors of 45 are 3 and 5.
135 factors to [3 3 3 5] 25 factors to [5 5] Common factors are [5] LCM = 135 * 25 / 5 = 675