Question

Subjective question on number of elements
(a) U={x: x is positive integer less than 1000 and divisible by 7), n(U) = ?
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Answer 1

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U={x: x is positive integer less than 1000 and divisible by 7}

$n(U) = [ \frac{1000}{7} ] = 142$

Where [ x ] = Greatest Integer but not greater than x

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