यदि \(a_1=9\) और प्रत्येक अगला पद पिछले पद से (7) कम है, तो स्पष्ट नियम क्या होगा?
If \(a_1=9\) and each next term is (7) less than the previous term, what is the explicit rule?
Explanation opens after your attempt
B. \(a_n=16-7n\)
Concept
The first term is (9) and the difference is (-7), so (a_n=9+(n-1)(-7)=16-7n). When forming a rule from words, treat decrease as a negative difference.
Why this answer is correct
The correct answer is B. \(a_n=16-7n\). The first term is (9) and the difference is (-7), so (a_n=9+(n-1)(-7)=16-7n). When forming a rule from words, treat decrease as a negative difference.
Exam Tip
पहला पद (9) और अंतर (-7) है इसलिए (a_n=9+(n-1)(-7)=16-7n)। शब्दों से नियम बनाते समय घटाव को ऋणात्मक अंतर मानें।
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