MATHEMATICS PROBLEM SOLVER

It is a site for parents, students and teachers. This site can help O-LEVEL or GCSE secondary school students in mastering mathematics subject. It intends to involve the learners by making them follow up the examples before they can do questions on their own at the TRY THIS.... section. There are some videos, tests, quizzes and past examination questions. Learning the examples will ultimately give students the required confidence in solving various questions in mathematics.

Tuesday, 27 December 2016

SETS 5

If n(A)= 55 , n(B)= 90 and n(AuB)= 136, find n(AnB).

Solution

n(AuB) = n(A) + n(B) - n(AnB)

136 = 55 + 90 - n(AnB)

136 = 145 - n(AnB)

136 - 145 = - n(AnB)

-9 = -n(AnB)

n(AnB) = 9 [after dividing by -1 both sides]

Hence n(AnB) = 9 answer

TRY THIS………….

If n(A)= 89 , n(B)= 92 and n(AuB)= 137, find n(AnB).

1 comment:

olevel maths27 December 2016 at 14:40
Sets is a very interesting topic in mathematics. It is normally covered in Form II, although a form IV student can find it as a revision for NECTA preparations. ore examples on this topic have been posted and more newer examples will be added as well. Hope you enjoy.
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