Answer:
a)
Given,
Word INSANITY
Here the word INSANITY has 8 letters with 2 I's , 2 N's & remaining were different
So,
Number of arrangements = 8! / (2!*2!*1!*1!*1!*1!)
= 8! / (2*2)
= (8*7*6*5*4*3*2*1) / 4
= 10080
b)
Given word TENNESSEE
Here the word contains 9 letters with 4 E's , 2 N's , 2 S's & 1 T
So, they can arrange in = 9! / (4!*2!*2!*1!)
= (9*8*7*6*5*4*3*2*1) / (4*3*2*1*2*2*1)
= 3780
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