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Question

If roots of an equation xn1=0 are 1,a1,a2....an1, then the value of (1a1)(1a2)(1a3).....(1an1) will be

A
n
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B
n2
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C
n!
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D
0
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Solution

The correct option is A n
xn1=(x1)(xa1)(xa2).........(xan1)xn1x1=(xa1)(xa2).........(xan1)(xa1)(xa2).........(xan1)=1+x+x2+.....xn1
put x=1.
(1a1)(1a2).........(1an1)=1+1+1....+1(n times)=n

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