अनुक्रम \(20,15,7,-8,\ldots\) के लिए कौन सा पुनरावर्ती नियम सही है?
Which recursive rule is correct for the sequence \(20,15,7,-8,\ldots\)?
Explanation opens after your attempt
A. (a_1=20, a_{n+1}=a_n-(3n+2))
Concept
The subtractions are (5,8,11), so (3n+2) is subtracted. Exam tip: match both the first term and the subtraction pattern.
Why this answer is correct
The correct answer is A. (a_1=20, a_{n+1}=a_n-(3n+2)). The subtractions are (5,8,11), so (3n+2) is subtracted. Exam tip: match both the first term and the subtraction pattern.
Exam Tip
घटाव (5,8,11) हैं इसलिए (3n+2) घटता है। पहला पद और घटाव दोनों मिलाने चाहिए।
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