# Sequences - math puzzle

What are the next numbers in the following sequences?

a: 77, 143, 221, 323, 437

b: 1, 5, 32, 288, 3413

c: 827, 23, 11, 6, 3

d: 2, 3, 5, 11, 31

e: 100, 121, 144, 202, 244

a: 77, 143, 221, 323, 437

b: 1, 5, 32, 288, 3413

c: 827, 23, 11, 6, 3

d: 2, 3, 5, 11, 31

e: 100, 121, 144, 202, 244

# Bob and John - math puzzle

Bob and John form a team together. Bob is as old as John will be when Bob is twice as old as John was when Bob was half as old as the sum of their current ages. John is as old as Bob was when John was half as old as he will become over ten years.

How old are Bob and John?

How old are Bob and John?

# Predicting share prices - math puzzle

What will be the probability that the price of a randomly choosen share that can be bought on the euronext stock exchange in Amsterdam, starts with the digit 1? |