Question

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Answer 1

Given:

• A is a set of months having 28 days.
• B is a set of days of the week that starts with A.
• C is a set of prime numbers less than 10.
• D is a set of days of the week that ends with Y.
• E is a set of quadrilaterals.

Roster Method:

• A = {January, February, March, April, May, June, July, August, September, October, November, December}
• B = {} or ∅
• C = {1, 2, 3, 5, 7)
• D = {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
• E = {Parallelogram, Rectangle, Square, Rhombus, Trapezoid, Kite}

Cardinalit(y):

• n(A) = 12
• n(B) = 0
• n(C)= 5
• n(D) = 7
• n(E) = 65

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