UPSC NDA Math Model Paper 2

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Comprehension:(Que No. 21 - 22)
Given a function f(x)={
−1 ifx≤0
ax+b if 0<x<1
1 if x≥1
; Where a, b are constants. The function continuous everywhere.
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Question : 22 of 120
 
Marks: +1, -0
What is the value of b?
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