UPSC NDA II 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow:
Let f(x)={
ax(x+1)+b‌x<1
x−1‌1≤x≤2
.
[NDA II 2023]
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Question : 63 of 120
 
Marks: +1, -0
If the function f(x) is differentiable at x=1, then what is the value of (a+b) ?
[NDA II 2023]
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