Question: please help me understand this lesson this under the topic of permutations. EXERCISES 1. How many different numbers can be obtained by arranging the digits

please help me understand this lesson this under the topic of permutations.

EXERCISES 1. How many different numbers can be obtained by arranging the digits 22 333 44455, all together in all possible ways? 2. In how many ways can 13 different cards be arranged in a row, if 10 of them must always be in a specific order relative to each other? 3. A class consists of 12 girls and 10 boys. In how many ways can the class form a line, if the girls always remain together in ascending order of height and the boys likeweise? 4. In how many ways can 6 men and 4 women be seated in a row of 10 chairs, if the men are to sit side by side

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