यदि (2a-5, a+4, 4a-7) अंकगणितीय श्रेणी में हैं, तो (a) का मान क्या होगा?
If (2a-5, a+4, 4a-7) are in an arithmetic progression, what will be the value of (a)?
Explanation opens after your attempt
B. (3)
Concept
From (2(a+4)=(2a-5)+(4a-7)), (2a+8=6a-12), so (a=5). Identify the middle term and form the equation.
Why this answer is correct
The correct answer is B. (3). From (2(a+4)=(2a-5)+(4a-7)), (2a+8=6a-12), so (a=5). Identify the middle term and form the equation.
Exam Tip
(2(a+4)=(2a-5)+(4a-7)) से (2a+8=6a-12), इसलिए (a=5)। मध्य पद को पहचानकर समीकरण बनाएं।
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