Answer:
a. Valid
b. Invalid
c. Invalid
d. Invalid
e. Valid
f. Valid
g. Invalid
Explanation:
a.
Since, it follows all the four rules,
Therefore, this number is <u>Valid</u>
b.
It uses upper case E, instead of lower case e.
Therefore, it is <u>Invalid</u>
c.
It violates third rule for including unit.
Therefore, it is <u>Invalid</u>
d.
It violates the first rule. As, there is a space between 6 and e. While in the example given in question, there is no gap.
Therefore, it is <u>Invalid</u>
e.
Since, it follows all the four rules,
Therefore, this number is <u>Valid</u>
f.
Since, it follows all the four rules,
Therefore, this number is <u>Valid</u>
g.
It violates third rule for including unit.
Therefore, it is <u>Invalid</u>
