For Exercises 37–40, let
U = {x | x is the name of one of the months in a year}
J = {x | x ∈ U and x begins with the letter J}
Y = {x | x ∈ U and x ends with the letter Y}
V = {x | x ∈ U and x begins with a vowel}
R = {x | x ∈ U and x ends with the letter R}
Find n(J ∩ V).
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