Question : What is the value of $4^{2}-3^{2}+6^{2}-5^{2}+8^{2}-7^{2}$?
Option 1: 30
Option 2: 33
Option 3: 3
Option 4: 27
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Correct Answer: 33
Solution : $4^{2}-3^{2}+6^{2}-5^{2}+8^{2}-7^{2}$ $=(4+3)(4-3)+(6+5)(6-5)+(8+7)(8-7)$ $=7+11+15$ $=33$ Hence, the correct answer is 33.
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