Q. Number of five digit no. of form $d_{1} d_{2} d_{3} d_{4} d_{5}$ where ds $(i = 1, 2, 3, 4, 5)$ are digits and satisfying $d_{1} < d_{2} \leq d_{3} < d_{4} \leq d_{5}$ is -

151 106 Permutations and Combinations Report Error

$^{10} C_{5}$

Solution: