In a single throw of a fair die,what is the probability of getting a number less than $7$?

Three coins are tossed once. Find the probability of getting no head.

Let $S$ be the sample space of the random experiment of throwing simultaneously two unbiased dice and $E_k = \{(a, b) \in S : ab = k\}$. If $p_k = P(E_k)$,then which of the following is correct?

Let $\Omega$ be the sample space and $A \subseteq \Omega$ be an event. Given below are two statements:
$(S1) : \text{If } P(A) = 0, \text{ then } A = \phi$
$(S2) : \text{If } P(A) = 1, \text{ then } A = \Omega$
Then:

If two dice are thrown simultaneously,what is the probability of getting $1$ on the first die?

What is the probability of getting a doublet when two dice are thrown?