6.3 A lingerie manufacturer produces ladies’ knickers in packs of five pairs. Quality control has been erratic and they estimate that one in every ten pairs of knickers leaves the factory without the trim sewn on. What is the probability that in a pack of five pairs of knickers:

(a) There are no pairs without the trim?

(b) There are two or fewer pairs without the trim?

(c) There is more than one pair without the trim?

(d) The majority of pairs are without the trim?