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The object of the following flow-chart is to rearrange the numbers in boxes 1, 2 and 3 in such a fashion that, at the end:

Box 3 will always contain the largest number,
Box 1 will always contain the smallest number,

However, this flow-chart is INCORRECT. As it stands, it will not accomplish the desired purpose.

Which one instruction must be changed to correct the flow-chart? enter image description here

In order to correct this flow-chart, we must change Instruction No.

So that the first box-number mentioned in it is box-number.............

And the second box-number mentioned in it is box-number.............

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We want to arrange the numbers so that reading down from 1 to 3, they are increasing in size. There is one particular branch which is clearly wrong.

Which one?

Look at the 2 branches coming off step 5.

I still don't see it

The yes branch... does that look a bit strange?

Nope

Step 5's "Yes" branch says "if $box3 < box2$ then end" - we always want $box2 < box3$ so this has to be wrong.

Wait - so that means the answer is...

In order to correct this flow-chart, we must change Instruction No. 5
So that the first box-number mentioned in it is box-number 2
And the second box-number mentioned in it is box-number 3

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  • $\begingroup$ @AeJey just trying to use spoiler tags a bit more effectively :-) $\endgroup$ – Joe Nov 27 '14 at 10:11
  • $\begingroup$ I liked it. Will try to adopt it in my answers too. Hope it will be okay for you. :) $\endgroup$ – AeJey Nov 27 '14 at 10:25

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