Literal$:-$ ` every`

occurrence of a variable in its true form $(or)$ complemented form.

Example$: A.\overline{B}+\overline{A}.B$

Number of literals$=4$

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**Dual =** **"The dual of a compound proposition that contains only the logical operators ∨, ∧, and ¬ is the compound proposition obtained by replacing each ∨ by ∧, each ∧ by ∨, each T by F, and each F by T. The dual of s is denoted by s∗."**

we don't negate any of the literal.

**Answer:**

**a) p$\vee$∼q$\vee$∼r**

**b) (p$\vee$q$\vee$r)$\wedge$s**

**c) (p$\wedge$T)$\vee$(q$\wedge$F)**

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