Relations and Functions

Relations and Functions

Question

Write the following sets in the roster form :

C = {x : x is a two-digit natural number such that the sum of its digits is 8}

Answer

C = {x : x is a two-digit natural number such that the sum of its digits is 8}
rightwards double arrow  x = 17, 26, 35, 44, 53, 62, 71, 80
Hence, roster form of set C is {17, 26, 35, 44, 53, 62, 71, 80}

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