यदि (a=13), (d=6) और \(a_n=121\) है तो (n) का मान क्या है?
If (a=13), (d=6), and \(a_n=121\), what is the value of (n)?
Explanation opens after your attempt
C. (19)
Concept
From (121=13+(n-1)6), (108=6(n-1)) so (n=19). After finding (n-1), add (1).
Why this answer is correct
The correct answer is C. (19). From (121=13+(n-1)6), (108=6(n-1)) so (n=19). After finding (n-1), add (1).
Exam Tip
(121=13+(n-1)6) से (108=6(n-1)) इसलिए (n=19)। (n-1) मिलने के बाद (1) जरूर जोड़ें।
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