यदि (a,b,c) अंकगणितीय श्रेणी में हैं और (a=-6), (c=18), तो (b-a) कितना है?
If (a,b,c) are in an arithmetic progression and (a=-6), (c=18), what is (b-a)?
Explanation opens after your attempt
C. (12)
Concept
The middle term is \(b=\frac{-6+18}{2}=6\), so (b-a=6-(-6)=12). In three terms, the middle term is the average.
Why this answer is correct
The correct answer is C. (12). The middle term is \(b=\frac{-6+18}{2}=6\), so (b-a=6-(-6)=12). In three terms, the middle term is the average.
Exam Tip
मध्य पद \(b=\frac{-6+18}{2}=6\), इसलिए (b-a=6-(-6)=12)। तीन पदों में मध्य पद औसत होता है।
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