Write $F = {5, 10, 15, 20}$ in set builder form.

F = {x | x = 5 n, n \in N, n < 4}

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F = {x | x = 5 n, n \in N, n \leq 4}

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Cannot be determined

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None of these

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Solution

The correct option is D $F = {x | x = 5 n, n \in N, n \leq 4}$
Since, the given set can be written as {x : x is a natural number upto 20 and divisible by 5}
Hence, $F = {x | x = 5 n, n \in N, n \leq 4}$

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