If a|b and a|c, then
A. a|bc
B. c|a
C. a|(b+c)
D. b|a
Answer:A
If a|b and a|c, then
A. a|bc B. c|a C. a|(b+c) D. b|a
Explanation: If a|b and a|c then b = am and c = an for some integer m and n. Hence, b + c = a(m + n). Therefore, a|(b+c).