Varsity Math 142

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With the French Open about to begin, it’s time for another tennis puzzle.

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Clay Court

A Golden Set

A golden set in tennis occurs when one player wins all 24 points of a set. In the French Open, women play the best two of three sets.

What is the probability of a golden set somewhere in a specified women’s match if each point is determined by flipping a coin?

Combining Rule

In the set of numbers below, 72 and 99 are “combined” to produce 27. Then 27 and 45 are “combined” to produce 18 and so on. The final 7 is not a misprint.

     99     45     39     36     28     21
72      27     18     21      x      13     7

What is x?

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Solutions to week 141

The solution to Sudoku Variant is shown below. In Making 8 and 16, 8 = 4.7 + .8 and 16 = (.7 – .2)-4

Sudoku Variant Solution

Making 8 and 16 answer explained:
8 = 4.7 + .8 = 41.5 = (22)1.5 = 23 = 8
16 = (.7 – .2)-4 = .5-4 = 1/.54 = 24 = 16

Recent Weeks

Week 141: Sudoku Variant & Making 8 and 16, solutions to Nick’s Birthday & Burning Ropes

Week 140: Nick’s Birthday & Burning Ropes, solutions to Pondering Productivity & Cornfield Planning

Week 139: Pondering Productivity & Cornfield Planning, solutions to Close to a Quart & Math Party

Week 138: Close to a Quart & Math Party, solutions to Room for One More & End Points

Week 137: Room for One More & End Points, solutions to Sevens and Elevens & Three-Digit Squares

Links to all of the puzzles and solutions are on the Complete Varsity Math page.

Come back next week for answers and more puzzles.