Mathematics Past Questions

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241

If the 7th term of an AP is twice the third term and the sum of the first four terms is 42, find the common difference.

242

Find the sum of the first 20 terms of the series 8, 12, 16, ....., 96

243

An operation * is defined on the set of real numbers by a * b = ab + 2(a + b + 1). find the identity element

244

In the diagram above calculate the value of x

245

Three straight lines EF, GH and LK interest at O as shown above. If ∠KOF = 52^o and ∠LOH = 85^o, calculate the size of ∠EOG.