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a,b

\in

R হলে নিচের কোনটি সঠিক?

|a + b| \geq |a| + |b|

|a - b| \geq |a| + |b|

|a - b| \leq |a| + |b|

|a - b| \leq |a| - |b|

ANS : 3

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