एक बचत चुनौती में पहले दिन (90) रुपये जमा किए गए और हर अगले दिन (30) रुपये अधिक जमा किए गए। (14) दिनों में कुल कितनी बचत होगी?
In a saving challenge (90) rupees are deposited on the first day and (30) rupees more each next day. What is the total saving in (14) days?
Explanation opens after your attempt
C. (3990)
Concept
The amounts are the AP \(90,120,150,\ldots\) and \(S_{14}=3990\). Exam tip: treat the number of days as the number of terms.
Why this answer is correct
The correct answer is C. (3990). The amounts are the AP \(90,120,150,\ldots\) and \(S_{14}=3990\). Exam tip: treat the number of days as the number of terms.
Exam Tip
राशियां \(90,120,150,\ldots\) समान्तर श्रेणी हैं और \(S_{14}=3990\)। परीक्षा में दिनों की संख्या को पदों की संख्या मानें।
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