Question 21 — IGCSE 0580 Oct/Nov 2025 Paper 13
Cambridge IGCSE Mathematics 0580, Core tier, non-calculator. Topic: Algebra · Sequences. Worth 6 marks.
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Question text
21 These are the first four terms of a sequence.
–6 1 8 15
(a) Write down the next term.
................................................. [1]
(b) Write down the term-to-term rule.
................................................. [1]
(c) (i) Find the nth term.
................................................. [2]
(ii) Is 688 a term in this sequence?
Explain how you decide.
.................... because .........................................................................................................
............................................................................................................................................. [2]
(cid:300)(cid:211)(cid:266)(cid:174)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:224)(cid:250)(cid:184)(cid:254)(cid:215) [Turn over
© UCLES 2025 (cid:300)(cid:295)(cid:177)(cid:249)(cid:212)(cid:288)(cid:244)(cid:265)(cid:225)(cid:237)(cid:238)(cid:209)(cid:265)(cid:203)(cid:275)(cid:290)(cid:249)(cid:258) 0580/13/O/N/25
(cid:293)(cid:213)(cid:229)(cid:213)(cid:181)(cid:277)(cid:197)(cid:245)(cid:197)(cid:245)(cid:261)(cid:261)(cid:197)(cid:213)(cid:229)(cid:277)(cid:229)(cid:213)
IGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
* 0000800000012 *
12
(cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:2)(cid:3)(cid:44)
NIGRAM
DFD
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