Which of the following statements are correct? Write a correct form of each of the incorrect statements.
(i)`phi{a , b}`
ii. `phisub{a , b , c}`
iii. `{x : x+3=3}=phi`

Explanation

i) `phi` is not an element of `{a, b}`.

The correct form is `phi sub {a, b}`

ii) Empty set `phi` is a subset of every set.

iii)`{x:x+3=3}={x:x=0}={0}`

The correct form is `{x:x+3=3} != phi`.