Q.
The equation ex-x-1=0 has
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a
Only one real root x=0
b
At least two real roots
c
Exactly two real roots
d
Infinitely many real roots
answer is A.
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Detailed Solution
ex=x+1⇒1+x1!+x22!+.....=x+1 ⇒x22!+x33!+....=0 x2=0, x3=0, ....xn=0Hence, x=0 only one real root.
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