Are there more points on ab than point a and b?

Three coins are flipped. what is the probability that there will be at least two tails?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r