536 Puzzles and Curious Problems

168 Combinatorial & Topological Problems

are) until the ten form five straight rows with four ships in every row. How
should the admiral do it?

441. CONSTELLATION PUZZLE

The arrangement of stars in the illustration is known as "The British

Constellation." It is not given in any star maps or books, and it is very diffi-

cult to find on the clearest night for the simple reason that it is not visible.

The 21 stars form seven lines with 5 stars in every line.

... : tr

~~:......... ". w··· ...... : ~ :.

.... """, ~ ... : ... .....

'. '1.(.... .Joo. "r ......

'. : .... ~: •••. oJ\.

~ W':-.; .... w

./ .... * ~ .. (, .... (f

-6 ".: .... ;

... ~. :.

'Q..

.. ~

Can you rearrange these 21 stars so that they form eleven straight lines
with 5 stars in every line? There are many solutions. Try to find a sym-
metrical one.