Brain Teasers
2, 6, 15, 28, ?, 78
Find the missing number in the following series:
2, 6, 15, 28, ?, 78
2, 6, 15, 28, ?, 78
Answer
55First take 1 multiplied by the first prime number (2), 2 * second prime number (3), 3 * third prime number (5) and so on.
Therefore the answer is 5 * 11 = 55.
Hide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments hidden to avoid spoilers.
Follow Braingle!