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Question

State the following set is finite or infinite.
M = {r : r=3n ; nϵW and 6<n15}
If the answer is finite then write 1 else write 0.

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Solution

Since n is a whole number, possible values of n satisfying the condition 6<n15 are 7,8,9,10,11,12,13,14,15 and the corresponding values of r are also finite.
Since the set has 9 elements, set M is a finite set.

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