Medium Mathematics Arithmetic Progressions (AP) Class 10 Level 72

एक मशीन पहले घंटे (120) पैकेट बनाती है और हर अगले घंटे (8) पैकेट कम बनाती है। पहले (11) घंटों में कुल उत्पादन कितना होगा?

A machine makes (120) packets in the first hour and (8) fewer packets each next hour. What is the total production in the first (11) hours?

Explanation opens after your attempt
Correct Answer

B. (880)

Step 1

Concept

The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is B. (880). The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(120,112,104,\ldots\) घटती समान्तर श्रेणी है और \(S_{11}=880\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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Mathematics Answer, Explanation and Revision Hints

एक मशीन पहले घंटे (120) पैकेट बनाती है और हर अगले घंटे (8) पैकेट कम बनाती है। पहले (11) घंटों में कुल उत्पादन कितना होगा? / A machine makes (120) packets in the first hour and (8) fewer packets each next hour. What is the total production in the first (11) hours?

Correct Answer: B. (880). Explanation: उत्पादन \(120,112,104,\ldots\) घटती समान्तर श्रेणी है और \(S_{11}=880\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें। / The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

Which concept should I revise for this Mathematics MCQ?

The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

What exam hint can help solve this Mathematics question?

उत्पादन \(120,112,104,\ldots\) घटती समान्तर श्रेणी है और \(S_{11}=880\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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