Question

Find the percentage of doublet between 1 to 100

Answer 1

we have 9 doublets ( 11,22,33,44,55,66,77,88,99)
so percentage is (9/100)*100= 9%

Answer 2

By doublet in mathematics, we mean a number of two digit with similar digits. In number system we have 90 two digit numbers. In the set of two digit numbers, we have 9 doublets such as 11 , 22 , 33 , 44 , 55 , 66 , 77 , 88 , 99

From 1 to 100 we have 100 numbers and 9 doublets in there. So, the percentage of doublet between 1 to 100 is (9/100)*100%

                                                                       = 9%

Answer: 9% doublet present in between 1 to 100.