Consider drawing n semicircles on and above a horizontal line, with no two semicircles intersecting. In parts

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Consider drawing n semicircles on and above a horizontal line, with no two semicircles intersecting. In parts (a) and (b) of Fig. 1.10 we find the two ways this can be done for n = 2; the results for n = 3 are shown in parts (c)-(g).
(b) (a) (c) (d) (f) (e) (g)

(i) How many different drawings are there for four semicircles?
(ii) How many for any n ‰¥ 0? Explain why.

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