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Grade: 12
        
the number of different ways in which 8 persons can stand in a row so that between 2 particular person A and B there are always 2 persons
​a. 60*5!
​b. 15*51*5!
c. 4!*5!
d. 15*5!*4!
one year ago

Answers : (1)

Daniel
15 Points
							We will select two persons from 6 others by 6c2 then make a string of the selected person and (AB) then will arrange the string along with 4 rest people by 5! And then arrange people in the string by2!*2! Giving- (6c2*2!*2!)(5!)=(15*4)(120)=3600...hope this helps.
						
one year ago
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