MCQ
The factorisation of $a b-a-b+1$ is
- ✓$(a-1)(b-1)$
- B$(a+1)(b+1)$
- C$(a-1)(b+1)$
- D$(a+1)(b-1)$
✓
Answer
Correct option: A.
$(a-1)(b-1)$
a
$a b-a-b+1$
$=a(b-1)-1(b-1)$
$=(a-1)(b-1)$
$a b-a-b+1$
$=a(b-1)-1(b-1)$
$=(a-1)(b-1)$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The maximum length of a pencil that can be kept in a rectangular box of dimensions $12 cm \times 9 cm \times 8 cm$, is
→The value of $\text{log}24\ – \text{log}15 + \text{log}40 $ is equal to:
→The following pie chart gives the distribution of constituents in the human body. The central angle of the sector showing the distribution of protein and other constituents is:
$a b-a-b+1=?$
→The height of a cylinder is 80 cm and the diameter of its base is 7 cm. The whole surface area of the cylinder is
Which of the quadrilaterals has all angles as right angles, opposite sides equal and diagonals bisect$-$each other?
→The common factor of $14 \mathrm{a}^{2} \mathrm{b}$ and $35 \mathrm{a}^{4} \mathrm{b}^{2}$ is
→Tick the correct answer in the following: The lengths of the parallel sides of a trapezium are $19\ cm$ and $19\ cm$ and its area is $128\ cm^2.$ The distance between the parallel sides is:
→The smallest number by which 841 be multiplied so that the product becomes a perfect cube is
Which of the following is not a random experiment?