UPSC NDA I 2024 Mathematics Paper

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Question : 106 of 120
 
Marks: +1, -0
If a,b,c are in HP, then what is ‌
1
b−a
+‌
1
b−c
equal to ?
1. ‌
2
b

2. ‌
1
a
+‌
1
c

3. ‌
1
2
(‌
1
a
+‌
1
b
+‌
1
c
)

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