Predict my position
Logic
Level
2
If there are 20 people in a bank for deposits and each is given a token number ranging between 1 and 20 (inclusive), then what can be the maximum call for 19, if all the prime numbers to be called at once and '20' is not called before '2'?
19th
18th
20th
8th
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1 solution
As there are only a total of 20 token numbers, and each person is given only one, there are actually 20 possible chances for token number '19' to be called. So, the maximum call for '19' can be 20 (which means token number '19' is the last person to deposit). But, as there exist few conditions that all the primes to be called at once and '20' isn't allowed to come before '2', we know '2' is the first & least prime number and thereon 3, 5, 7, 11, 13, 17 & 19 are to be grouped together with '2'. Then the token number '20' is the last person to deposit. Since, the position of '20' is 20, the maximum position of '19' has to be 19.