Answer:
1.statistical concepts.
2.Arranging people, digits, numbers, alphabets, letters, and colours are examples of permutations. Selection of menu, food, clothes, subjects, the team are examples of combinations.
Step-by-step explanation:
3.Total arrangemnets = 20160
Step-by-step explanation:
Given the word
REFERENCES
Total number of words in the letter = 10
Vowels in the words are E, E, E
No. of vowels = 3
No. of consonents = 10 - 3 = 7
If we make a bundle of all the vowels, they can be arranged only in one way because they all are same
Therefore, taking vowel as a single entity and the remaining 7 letters we get in total 8 objects to be arranged. Since the word contains two R s, out of these 8 objects 2 are same
Therefore total arrangements
=\frac{8!}{2!}=2!8!
=4\times7!=4×7!
