| Tissues/organs | Embryonic germ layers | ||
| (P) | liver | (i) | ectoderm |
| (Q) | cerebellum | (ii) | endoderm |
| (R) | femur | (iii) | mesoderm |
Four students of class XII are given a problem to solve independently. Their respective chances of solving the problem are: \[ \frac{1}{2},\quad \frac{1}{3},\quad \frac{2}{3},\quad \frac{1}{5} \] Find the probability that at most one of them will solve the problem.