| List-I (Elements) | List-II (Properties in their respective groups) |
|---|---|
| (A) Cl,S | (I) Elements with highest electronegativity |
| (B) Ge, As | (II) Elements with largest atomic size |
| (C) Fr, Ra | (III) Elements which show properties of both metals and non metal |
| (D) F, O | (IV) Elements with highest negative electron gain enthalpy |
Elements with highest electronegativity → F, O
Elements with largest atomic size → Fr, Ra
Elements which show properties of both metals and non-metals (metalloids) → Ge, As
Elements with highest negative electron gain enthalpy → Cl, S
If the mean and the variance of 6, 4, a, 8, b, 12, 10, 13 are 9 and 9.25 respectively, then \(a + b + ab\) is equal to:
Given three identical bags each containing 10 balls, whose colours are as follows:
| Bag I | 3 Red | 2 Blue | 5 Green |
| Bag II | 4 Red | 3 Blue | 3 Green |
| Bag III | 5 Red | 1 Blue | 4 Green |
A person chooses a bag at random and takes out a ball. If the ball is Red, the probability that it is from Bag I is $ p $ and if the ball is Green, the probability that it is from Bag III is $ q $, then the value of $ \frac{1}{p} + \frac{1}{q} $ is: