Math & Science ⇒ Error in compilation

[Achyut4869]

I am unable to get 4 options with the mathematical commands I have given. Can someone please help me out

[rais]

\left as well as \right require an argument, typically one off \{[(. for \left and one off .)]\} for \right.
If you don't need delimiters to be expanded on either side, omit \left and \right.
If that does not help you, please provide a minimal working example that demonstrates your problem.

KR
Rainer