Five friends each shake hands once with every other friend. How many handshakes are there?
Answer and explanation
Correct answer: B. 10
- Step 1: Each friend shakes 4 hands, which gives 5 x 4 = 20 counts. Step 2. Each handshake is counted twice, so divide by 2: 10. Answer: 10. Why not the others: 20 counts every handshake twice; 15 and 25 are not the count.
Practise more Patterns and Logic Puzzles.
Free questions with an explanation for every one, and full timed Uzbekistan Presidential Schools Admission Test mock tests.