# Question 19

## Question 19

Question 19:

Rastapopoulos had announced that it would issue six-digit identity numbers to all his soldiers using numbers 0 through 9. If each number has to differ from every other number in at least two places. What is the highest population the island can have?

a) 99999 b) 100000 c) 999999 d) None of these

Rastapopoulos had announced that it would issue six-digit identity numbers to all his soldiers using numbers 0 through 9. If each number has to differ from every other number in at least two places. What is the highest population the island can have?

a) 99999 b) 100000 c) 999999 d) None of these

**TECHNOTHLON**- Admin
- Posts : 39

Join date : 2016-07-19

## Re: Question 19

Answer keys are available on Technothlon downloads page.Type your score here accordingly.

**All the best**- Guest

## Correction in Answer Key

In the question, it is clearly stated that the identity numbers shoud be six digits long.

I feel that you have failed to consider that in your solution.

By that logic the first digit cannot be zero.

Therefore, the total number of ways should be 9x10x10x10x10 = 90000

Therefore, the answer should be d) None of these and not what is given in the answer key.

I feel that you have failed to consider that in your solution.

By that logic the first digit cannot be zero.

Therefore, the total number of ways should be 9x10x10x10x10 = 90000

Therefore, the answer should be d) None of these and not what is given in the answer key.

**Participant**- Guest

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