What is the scalar projection of the vector $a = 2 \hat{i} + 3 \hat{j} + 2 \hat{k}$ on the vector $b = \hat{i} + 2 \hat{j} + \hat{k}$ ?

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Let $R$ be a binary relation defined on a non-empty set $A$ . Under which condition is $R$ classified as an equivalence relation?
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