[Partheeban S]

Start from the negative 1 and change the sign for the 3 no.s .so it becomes +1 -1 -1 +1 +1.....+1  9 times .now start changing the sign from the-1 and complete the full polygon this way and we will reach at the answer.

1. That is negative sign is shifted to the adjacent side opposite to which you started changing signs.

[Partheeban S]

1. The set contains S={5,10,15,25,35,......}

[Partheeban S]

1. This method will give the required answer

[Partheeban S]

1. This method will give the required answer

[Partheeban S]

1. This method will give the required answer

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