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There is a combination lock with four inputs 0-9. Can you figure it out?

+1 vote

There is a combination lock with four inputs 0-9. Can you figure it out?

The second isn't a 6.

Only one digit starts with a vowel.

The fourth is greater than the first, is greater than or equal to the third, and is greater than the second.

Either the first two numbers are even & the last two numbers are odd or vice versa.

The difference between the 1st & 2nd is the same as the difference between the 4th & 3rd (order matters).

One of the numbers is prime; three are composite.

posted Jun 8, 2019 by Aarati Mahajan

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1 Answer

0 votes

8- 4- 5- 9

primes- 2,3,5,7, composites- 4,6x,8,9, neither prime not composite- 0,1
excluded - 6 as per condition 1, so three of composite numbers are 4,8,9 as per condition 6
9 is the last and 8 is the first, because the fourth numbers must be the greatest of four as per condition 3.
4 must be second, if it is the third, then 9-4=5 and 8-5=3, makes the order 8,3,4,9 but first and last two numbers must be both even or both odd as per condition 4.
8,4,5,9 meets all conditions

answer Jun 8, 2019 by Hanifa Mammadov

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