Solution
Given : $$(a + b) = 9$$ and $$a^2 + b^2 = 61$$
Using $$(a + b)^2 = a^2 + b^2 + 2ab$$
=> $$(9)^2 = 61 + (2 \times ab)$$
=> $$2 ab = 81 - 61 = 20$$
=> $$ab = \frac{20}{2} = 10$$
=> Ans - (B)
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
