Explanation

(c)
The number forms by the figure 4, 5, 6, 7, 8 which is greater than 56000 is in two cases.
Case I Let the ten thousand digit place number be greater than 5. The number of numbers
$= 3 \times 4 \times 3 \times 2 \times 1 = 72$
Case II Let the ten thousand digit number be 5 and thousand digit number be either 6 or greater than 6. Then, the number of numbers $= 3 \times 3 \times 2 \times 1 = 18$
$\therefore$ Required number of ways $= 72 + 18 = 90$