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Question
Write the following sets in roster (Tabular) form :
A4 = {x : x is a two digit number and sum of digits of x is 7}
Solution
A4 = {x : x is a two digit number and sum of digits of x is 7}
∵ x is a two digit number and sum of digits of x is 7
∴ x = 16, 25, 34, 43, 52, 61, 70
∴ Given set in roster (Tabular) form is
A4 = {16, 25, 34, 43, 52, 61, 70}
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