IB Math AA SL · 2019 to 2025

1.9 Binomial theorem

20 past paper questions from 15 papers across 8 exam sessions. See what repeats, then practise the same skills with AI marking.

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SL archive · 2021 to 2026

1.9 Binomial theorem

Latest exam session: May 2026

questions
20
questions
papers
15
papers
exam sessions
8
exam sessions
micro-topics
3

Micro-topics in 1.9 Binomial theorem

In syllabus order. The ring is the share of papers each appears in.

  • 5

    1.9.1

    Pascal's triangle & nCr

    2 questions · in 5% of papersAppears in 2 of the 40 Math AA SL papers analysed (5%), at least once each.

    Less common

    last May 26 P1 TZC

  • 15

    1.9.2

    Binomial expansion

    7 questions · in 15% of papersAppears in 6 of the 40 Math AA SL papers analysed (15%), at least once each.

    Regular

    last May 25 P1 TZ1

  • 28

    1.9.3

    Finding a term

    11 questions · in 28% of papersAppears in 11 of the 40 Math AA SL papers analysed (28%), at least once each.

    Frequently tested

    last May 26 P1 TZC

Exam pattern

How often each micro-topic has been examined, year by year. Each label is explained under the grid.

Does it repeat?

Questions per year for each micro-topic.

fewermore

Micro-topic2019202120222023202420252026
1.9.3Finding a termFrequently tested
·Finding a term, 2019: 0 questions2Finding a term, 2021: 2 questions2Finding a term, 2022: 2 questions2Finding a term, 2023: 2 questions2Finding a term, 2024: 2 questions2Finding a term, 2025: 2 questions1Finding a term, 2026: 1 question
1.9.1Pascal's triangle & nCrLess common
·Pascal's triangle & nCr, 2019: 0 questions·Pascal's triangle & nCr, 2021: 0 questions·Pascal's triangle & nCr, 2022: 0 questions·Pascal's triangle & nCr, 2023: 0 questions·Pascal's triangle & nCr, 2024: 0 questions1Pascal's triangle & nCr, 2025: 1 question1Pascal's triangle & nCr, 2026: 1 question
1.9.2Binomial expansionRegular
·Binomial expansion, 2019: 0 questions·Binomial expansion, 2021: 0 questions2Binomial expansion, 2022: 2 questions4Binomial expansion, 2023: 4 questions·Binomial expansion, 2024: 0 questions1Binomial expansion, 2025: 1 question·Binomial expansion, 2026: 0 questions
  • Frequently testedin at least a quarter of all papers, and still appearing in the last two years
  • Less commonin fewer than one paper in fifteen
  • Regularin roughly one paper in six or more

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Questions on 1.9 Binomial theorem, by exam session

Which papers asked about 1.9 Binomial theorem, and which question numbers. Open a paper to see them highlighted.

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Frequently asked questions

Short answers about this page.

Which Math AA SL exam sessions are covered for 1.9 Binomial theorem?

11 exam sessions from 2021 to 2026, the latest May 2026. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 15 papers in this archive.

Which 1.9 Binomial theorem topic comes up most?

Finding a term (1.9.3): in 28% of papers, last seen May 26 P1 TZC. Usually "find / solve", worth about 4.7 marks in a paper that includes it.

Can I see the original question and mark scheme?

No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.

What do "banker", "due" and "rising" mean?

Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.

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