Two balanced dice are rolled. Find the probability that the numbers on two dice are equal.

There are $6$ green,$5$ red,and $4$ blue identical balls in a bag. One ball is drawn at random from the bag. The probability that the ball drawn is not red is ...........

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. The probability that the card is not a picture card is ...........

The probability of the month of February in a leap year having $5$ Fridays is ..........

Two balanced dice are rolled simultaneously. Then,the probability that the numbers on both the dice are prime is ...........

$I$ toss three coins together. The possible outcomes are no heads,$1$ head,$2$ heads and $3$ heads. So,$I$ say that probability of no heads is $\frac{1}{4}$. What is wrong with this conclusion?