In a bag there are six red counters, eight yellow. counters and six green counters. An experiment consists of taking a counter at random from the bag, noting its colour and then replacing it in the bag. This procedure is carried out ten times in all. Find

(a) the expected number of red counters drawn,

(b) the most likely number of green counters drawn,

(c) the probability that no more than four yellow counters are drawn.