Acommunity center is organizing a dance . there are four large columns arranged at the corners of a square. the decorating committee will hang one large streamer from each column to every other column. how many streamers are needed?

For a better understanding of the explanation provided here please go through the diagram in the file which has been attached.

As we can see in the diagram there are four corners namely, A,B,C and D and each corner has four columns as depicted by the four vertical lines in the diagram.

Now, we have been told that the decorating committee will hang one large streamer from each column to every other column. Therefore, a streamer each will go from, say, the column at A to the columns at B,C and D. These streamers are, P,T and S, respectively.

Thus, if we have a nice look at the diagram we can see that the total number of streamers needed will be 6.

answer: x=60