Jamb Mathematics Past Questions For Year 2009
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)
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. 10/9
- D. 9/10
Question 18
If m n = n - (m+2) for any real number m and n find the value of 3(-5)?
- A. -6
- B. -8
- C. -10
- D. -12
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. -5/4
- B. -5/6
- C. zero
- D. 5
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
