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.

Thursday 13 March 2014

ARITHMETIC PROGRESSION C2

Find the sum of the 1st 30 terms of the following arithmetic progression: 4+6+8+…………………

Solution

d=2, A₁ = 4,n=30

S_n = n[2A₁ + (n-1)d]

S₃₀ = 30[2(4) + (30-1)d]

S₃₀ = 15[8 + 15d]

S₃₀ = 15[8 + 13(2)] since d=2

S₃₀ = 15[8 + 26]

S₃₀ = 15 x 34

S₃₀ = 510

Therefore the sum of 1st 16 terms is 510.

MATHEMATICS PROBLEM SOLVER

Thursday 13 March 2014

ARITHMETIC PROGRESSION C2

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