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Answer :
Sure, let's find which of these numbers have 3 as a factor.
To check if a number has 3 as a factor, we can simply see if it is divisible by 3.
A number is divisible by 3 if the sum of its digits is divisible by 3.
Let's go through each number one by one:
A. 83
- Sum of the digits: 8 + 3 = 11
- 11 is not divisible by 3, so 83 does not have 3 as a factor.
B. 61
- Sum of the digits: 6 + 1 = 7
- 7 is not divisible by 3, so 61 does not have 3 as a factor.
C. 12
- Sum of the digits: 1 + 2 = 3
- 3 is divisible by 3, so 12 has 3 as a factor.
D. 57
- Sum of the digits: 5 + 7 = 12
- 12 is divisible by 3, so 57 has 3 as a factor.
E. 21
- Sum of the digits: 2 + 1 = 3
- 3 is divisible by 3, so 21 has 3 as a factor.
F. 95
- Sum of the digits: 9 + 5 = 14
- 14 is not divisible by 3, so 95 does not have 3 as a factor.
So, the numbers that have 3 as a factor are:
- 12
- 57
- 21
Thus, the correct answers are:
- C. 12
- D. 57
- E. 21
To check if a number has 3 as a factor, we can simply see if it is divisible by 3.
A number is divisible by 3 if the sum of its digits is divisible by 3.
Let's go through each number one by one:
A. 83
- Sum of the digits: 8 + 3 = 11
- 11 is not divisible by 3, so 83 does not have 3 as a factor.
B. 61
- Sum of the digits: 6 + 1 = 7
- 7 is not divisible by 3, so 61 does not have 3 as a factor.
C. 12
- Sum of the digits: 1 + 2 = 3
- 3 is divisible by 3, so 12 has 3 as a factor.
D. 57
- Sum of the digits: 5 + 7 = 12
- 12 is divisible by 3, so 57 has 3 as a factor.
E. 21
- Sum of the digits: 2 + 1 = 3
- 3 is divisible by 3, so 21 has 3 as a factor.
F. 95
- Sum of the digits: 9 + 5 = 14
- 14 is not divisible by 3, so 95 does not have 3 as a factor.
So, the numbers that have 3 as a factor are:
- 12
- 57
- 21
Thus, the correct answers are:
- C. 12
- D. 57
- E. 21
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