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identify the number with only two factors
a. 12
b. 13
c. 14
d. 15
name the numbers which are multiples of 2.
a. 20 and 23
b. 24 and 56
c. 4
d. 5
the greatest common factor of 15, 21 and 36 is
a. 2
b. 3
c. 4
d. 5