A-LevelMathematicsSeries9709/12 · May/June 2010 · Q78 Marks
(a) Find the sum of all the multiples of 5 between 100 and 300 inclusive. (b) A geometric progression has a common ratio of -½ and the sum of the first 3 terms is 35. Find (i) the first term of the progression, (ii) the sum to infinity.
- (a)Find the sum of all the multiples of 5 between 100 and 300 inclusive.[3]
- (b)(i)the first term of the progression,[3]
- (b)(ii)the sum to infinity.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2010). The mark or mark type is shown in brackets.
- [B1] co
- [M1 A1] Use of correct sum formula. co
- [B1] co
- [M1 A1] Solution of equation. co
- [M1 A1√] Correct use of formula. √ for his a.
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