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Let X = {x : 1 le x le 50, x in N} A =...

Let X = `{x : 1 le x le 50, x in N}`
A = `{x: x `is multiple of `2}`
B = `{x: x` is multiple of `7}`
Then find number of elements in the smallest subset of `X` which contain elements of both `A` and `B`

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The correct Answer is:
29
NA
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