Teacha
  • Courses
  • Mock Exams
  • For Tutors
  • For Schools
  • Pricing
Log InStart Free
  1. Past Questions
  2. /
  3. WAEC
  4. /
  5. Mathematics
  6. /
  7. 2008
  8. /
  9. Q20
Question 20

If 2n = 128, find the value of (2n - 1)(5n - 1)

  • A.5(106)
  • B.2(106)
  • C.5(105)
  • D.2(105)
Objective

Question details

Exam body
WAEC
Subject
Mathematics
Year
2008
Question no.
#20
Type
Objective
Previous · Q19If cos (x + 25) o = sin 45 o , find the value of x Next · Q21 If x \(\alpha\) (45 + \(\frac{1}{2}y\)), which of the following is true>?

More from this paper

  • Q16The angles of a quadrilateral are (x + 10) o , 2y o , 90 o and (100 - y) o…
  • Q17If x o is obtuse, which of the following is true?
  • Q18If tan x = 1, evaluate sin x + cos x, leaving your answer in the surd form
  • Q22Simplify \(\frac{\log \sqrt{8}}{\log 4 - \log 2}\)
  • Q23A train travels 60km in M minutes. If its average speed is 400km per hour, find…
  • Q24An arc of a circle, radius 14cm, is 18.33cm long. Calculate to the nearest…
See all Mathematics 2008 questions
Teacha

Africa's learning & exam readiness platform. Built for students, tutors, and schools.

Platform

  • Courses
  • Mock Exams
  • Past Questions

For You

  • I'm a Tutor
  • I'm a School
  • Pricing

© 2025 Teacha. Built for African learners, tutors, and schools. Teacha is not affiliated with WAEC, NECO, or JAMB. All past questions are sourced from publicly available materials.

Privacy PolicyTerms of UseCookie Policy