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A four digit number is called a doublet if any of its digit is the same as only one neighbor. For example, 1221 is a doublet but 1222 is not a doublet. The number of such doublets are:A. 2259B. 2268C. 2277D. 2349

Harshit Singh , 2 Years ago
Grade 12th pass
anser 1 Answers
Pawan Prajapati

Last Activity: 2 Years ago

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