4 years ago

Which pair of numbers is relatively prime?

Mathematics

2 answers:

Lelechka [254]4 years ago

5 0

Answer:

Step-by-step explanation:

Just took quiz

podryga [215]4 years ago

4 0

Relatively prime means having no factors in common.

I will start by checking if they have the factor "3" in common: it's easy to check: the sum of its digit needs to be divisible by 3:

<span>a. 72 And 115

7+2=9
1+1+5=7

not true that both are divisible by 3
b. 120 And 835
1+2=3
8+3+5=16

</span>
<span><span>not true that both are divisible by 3
but, they're both divisible by 5! (0 or 5 at the end)
not relatively prime

</span> c. 201 And 735

2+1=3
7+3+5=15

both are divisible by 3!

d. 303 And 1041

3+3=6
1+4+1=6

both divisible by 3

the answer is a)
</span>

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