math

Sep P is the set of even numbers. Set Q is the set of multiples of 3. And R = {x|7 ≤ x < 24, x ∊ N}. The set P∩Q∩R contains some numbers. The sum of these numbers is:
a) 30
b) 54
c) 75
d) 120
e) 165

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  1. Set*

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  2. Start with R = {x|7 ≤ x < 24, x ∊ N}
    R = {7,8,9,10,....,23}
    Q = {3,6,9,12,.....}
    so Q∩R = {9,12,15,18,21}
    2 of those are even, so

    P∩Q∩R = {12,18}
    now, what is their sum?

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    Reiny

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