If the rightmost bit of a binary integer is one, the number must be

Question 6 options:

1)	odd.
2)	even.
3)	positive.
4)	negative.

How many symbols for digits are needed in a base six number system?

Question 7 options:

1)	Ten, 0-9.
2)	Sixteen, 0-9 and A-F.
3)	Seven, 0-6.
4)	Six, 0-5.