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Saturday, 24 October 2026
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Mathematics Past Questions and Answers

Jamb 2009 Mathematics Questions

Question 16:
The sum of the first n terms of the arithmetic progression 5, 11, 17, 23, 29, 35, ... is
  • A N(3n - 0.5)
  • B N(3n + 2)
  • C N(3n + 2.5)
  • D N(3n + 5)
View Answer & Explanation
Question 17:
Find to infinity, the sum of the sequence \(1, \frac{9}{10}, \left(\frac{9}{10}\right)^2, \left(\frac{9}{10}\right)^3,.....\)
  • A 10
  • B 9
  • C <sup style='font-size: smaller;'>10</sup>/<sub style='font-size: smaller;'>9</sub>
  • D <sup style='font-size: smaller;'>9</sup>/<sub style='font-size: smaller;'>10</sub>
View Answer & Explanation
Question 18:
If m * n = n - (m+2) for any real number m and n find he value of 3*(-5)
  • A -6
  • B -8
  • C -10
  • D -12
View Answer & Explanation
Question 19:
A binary operation ⊗ defined on the set of integers is such that m⊗n = m + n + mn for all integers m and n. Find the inverse of -5 under this operation, if the identity element is 0
  • A -<sup style='font-size: smaller;'>5</sup>/<sub style='font-size: smaller;'>4</sub>
  • B -<sup style='font-size: smaller;'>5</sup>/<sub style='font-size: smaller;'>6</sub>
  • C Zero
  • D 5
View Answer & Explanation
Question 20:
If Q is\( \left[ \begin{array}{cc}
9 & -2 \\
-7 & 4 \\
\end{array} \right]\) , then |Q| is
  • A -50
  • B -22
  • C 22
  • D 50
View Answer & Explanation