$A$ bag contains $3$ white and $7$ red balls. If a ball is drawn at random,what is the probability that the drawn ball is either white or red?

The probability of obtaining an even prime number on each die,when a pair of dice is rolled,is . . . . . . .

$A$ coin is tossed $3$ times. The probability of obtaining at least two heads is

If a dice is thrown twice,then the probability of getting $1$ in the first throw only is

Person $A$ can solve $90 \%$ of the problems given in the book and Person $B$ can solve $70 \%$. Then,the probability that at least one of them will solve the problem selected at random from the book is

$A$ die marked $1, 2, 3$ in red and $4, 5, 6$ in green is tossed. Let $A$ be the event 'the number is even' and $B$ be the event 'the number is red'. Are $A$ and $B$ independent?