अनुक्रम \(5,-10,20,-40,\ldots\) में सातवाँ पद क्या है?
What is the seventh term in the sequence \(5,-10,20,-40,\ldots\)?
Explanation opens after your attempt
C. (320)
Concept
The general term is (a_n=5(-2)^{n-1}), so (a_7=5(-2)6=320). Exam tip: an even power gives a positive sign.
Why this answer is correct
The correct answer is C. (320). The general term is (a_n=5(-2)^{n-1}), so (a_7=5(-2)6=320). Exam tip: an even power gives a positive sign.
Exam Tip
सामान्य पद (a_n=5(-2)^{n-1}) है इसलिए (a_7=5(-2)6=320) है। सम घात पर चिह्न धनात्मक होता है।
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