Question

which choices correctly represent numbers in base seven.
(a)575 base seven
(b) 656 base seven

If one is incorrect write it so it is correct.

Answer 1

in a base number system, you could only use the numerals 01 2 3 4 5 6

so what do you think?

PS. If they "have to" teach you about different number systems, tell your teacher to stick to either base 2 or 8.
At least that would have some relevance