The "Even" Dilemma

Find the 6-digit number beginning and ending in 2, given that it is the product of three consecutive even integers


The answer is 287232.

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3 solutions

If one of three consecutive numbers ends with 0 then the result will not be 2 at the last digit.

So, we have 2 × 4 × 6 2\times4\times6 which result will end with 8 and 4 × 6 × 8 4\times6\times8 which result will end with 2.

Three numbers must end with 4,6,8 consecutively.

Now look at this, 5 0 3 = 125000 50^3=125000 6 0 3 = 216000 60^3=216000 7 0 3 = 343000 70^3=343000 We can assume that the three numbers must be 54 × 56 × 58 54\times56\times58 or 64 × 66 × 68 64\times66\times68

As the solution, only answer is 64 × 66 × 68 = 287232 64\times66\times68 = \boxed{287232}

Adrian Neacșu
Apr 25, 2014

We have 58 3 = 195112 {58}^{3} = 195 112 . Which means that the consecutive even numbers should be close to 58.

Now we need the condition that the last digit is 2.

And I got 64 × 66 × 68 = 287232 64 \times 66 \times 68 = 287 232 .

Shreyansh Vats
Apr 25, 2014

I know the method understated is a bit vague but it is the way I did it.

Since the required number is a 6-digit number, it is bound to be a product of three 2-digit even numbers.

Let's say the first number is n. Then the corresponding numbers are (n+2) and (n+4).

On careful scrutiny, we find that if n>60, we'll get closer to our answer. In the end, we get 64.66.68 = 287232.

I am a novice to such problems and would ecstatically welcome refined solutions.

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