| clue | 2-digit number | % Correct |
|---|---|---|
| consecutive multiples of 9 | 36, 45, 54, {63} | 100%
|
| consecutive square numbers | 36, 49, 64, {81} | 93%
|
| consecutive prime numbers | 47, 53, 59, 61, {67} | 62%
|
| decreasing consecutive primes x 10 | 110, 70, 50, 30, {20} | 60%
|
| letter numbers of consecutive vowels | 1, 5, 9, 15, {21} | 56%
|
| 12, 9, 6, 3 in binary | 1100, 1001, 110, {11} | 44%
|
| first 4 numbers written as a single Roman numeral | 1, 5, 10, {50} | 31%
|
| consecutive Fibonacci numbers | 13, 21, 34, {55} | 27%
|
| decreasing consecutive cubes | 343, 216, 125, {64} | 27%
|
| 20th century start and end dates of the 2 world wars | 14, 18, 39, {45} | 22%
|
| days in consecutive months | 31, 31, 28, {31} | 22%
|
| Olympic years | 28, 32, 36, 48, {52} | 20%
|
| 20th century year of admission of last 4 US states | 12, 12, 59, {59} | 13%
|
| 20th century year of accession of last 4 UK monarchs | 10, 36, 36, {52} | 2%
|
| first five 2-digit numbers alphabetically | 18, 80, 88, 85, {84} | 2%
|
| first 8 digits of pi | 31, 41, 59, {26} | 0%
|