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A : If |a| = 13, |b| = 19, |a + b| = 24 then |a -b| = 20 R: for any vectors a,b, |a + b|^(2) + |a - b|^(2) = 2 (|a|^(7) + |b|^(2))

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both A and R are true and R is the correct EXPLANATION of A
Both A and R are true but R is not correct explanation of A
A is true but R is FALSE
A is false but R is true

Answer :C


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