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Y ask about Y ? (Posted on 2017-04-04) Difficulty: 2 of 5
(i)Y is a positive integer.
(ii) Y-1 is divisible by 5;
(iii) Y is divisible by 2,3,4,6,7,8 and 9.

What is the smallest Y?.

See The Solution Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Another approach Comment 5 of 5 |
(In reply to re: Another approach by Ady TZIDON)

The product Y*(Y-1) has all the factors of Y and Y-1.  My indirect method looks for potential values which could be the product and solves a quadratic to check.  Therefore 5 is included.
  Posted by Brian Smith on 2017-04-13 09:22:02

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