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क्या है जो साफ रहने पर काला होता है, लेकिन जब गन्दा होता है तो सफ़ेद होता है |
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Answer» Answer: blackboard Explanation: the COLOUR of blackboard is BLACK so when it's clean it colour is black and we write on it with CHALK .So,when it is DIRTY it's colour is WHITE |
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