Q.13. If A={x:x is a two digit number, the sum of whose digits is 12},
then n(A) is equal to: *
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{x:x is a two-digit natural number such that the sum of its digits is 8}
The elements of this set are 17,26,35,44,53,62,71 and 80 only.
Therefore, this set can be written in roster form as C=17,26,35,44,53,62,71,80.
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