



 
Hi Rahul, I can give you a hint. $100 = 4 \times 25.$ Write back if you need more assistance. Penny Rahul wrote back
Rahul, You are assuming that $n^2 = 100 \times p$ and thus $n^2 = 4 \times 25 \times p.$ Therefore $4$ divides the right side and hence it divides the left side. Hence $4 = 2^2$ divides $n^{2}.$ Can you complete the problem now? Penny  


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