Which is a Prime number?
A. 70
B. 73
C. 75
D. 78
(letter B)
How?
[tex]\rightarrow[/tex] Prime Numbers are group of numbers that only divisible by 1 or itself.
Factors of 73 = 1 and 73
[tex]73 \div 1 = 73\\73 \div 73 = 1[/tex]
How about the other?
[tex]\rightarrow[/tex] The other letters are not group of Prime numbers so we called as the group of Composite Numbers which is have more than 2 factors or more.
In letter A;
Factors of 70 = 1, 2, 5, 7, 14, 10, 35 and itself (70)
In letter C;
Factors of 75 = 1 , 3 , 5 , 15 , 25 and itself (75)
In letter D;
Factors of 78 = 1, 2, 3, 6, 13, 26, 39, and itself (78)
Additional +
- 1 is not a Prime number nor Composite number.
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