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What is the dirtiest city in India?

🗑️ "Ever Walked Through a City Where the Air Feels Thick Enough to Chew? Let’s Talk Real Solutions"...

Why is (n-1)(n+1)=n^2-1?

The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...