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Assertion: Number of different squares w...

Assertion: Number of different squares which can be formed on a chess board is 204. Reason : Number of ways in which r consecutive squares can be selected from n squares in a row is `(n-r)` (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not the correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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