which of the following statement is true? (a) 21 - (13 -5) = (21- 13) - 5 (b) 21 - 13 is not a whole number (c) 21× 1 = 21 × 0 (d) 13 - 21 is not a whole number .
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Ur answer is (d) 13-21 is not a whole number
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answer d 13 -21 is not a whole number
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