[" (6) 5.A four digit number is called a...

[" (6) 5.A four digit number is called a doublet if any of its digit is the same as only one neighbour.For example,"],[qquad [" 1221is a doublet but "1222" is not.Number of such doublets are "],[" (A) "2259," (B) "2268]]

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[" (6) 5.A four digit number is called a doublet if any of its digit is the same as only one neighbour.For example,"],[qquad [" 1221is a doublet but "1222" is not.Number of such doublets are "],[" (A) "2259," (B) "2268]]

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