एक दुकान की पहली रैक में (18) बोतलें हैं और हर अगली रैक में (3) बोतलें अधिक हैं। (9)वीं रैक में कितनी बोतलें होंगी?

The first rack of a shop has (18) bottles and each next rack has (3) more bottles. How many bottles are on the (9)th rack?

Explanation opens after your attempt
Correct Answer

B. (42)

Step 1

Concept

The number of bottles forms an AP. (a_9=18+8(3)=42).

Step 2

Why this answer is correct

The correct answer is B. (42). The number of bottles forms an AP. (a_9=18+8(3)=42).

Step 3

Exam Tip

बोतलों की संख्या समान्तर श्रेणी है। (a_9=18+8(3)=42)।

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एक दुकान की पहली रैक में (18) बोतलें हैं और हर अगली रैक में (3) बोतलें अधिक हैं। (9)वीं रैक में कितनी बोतलें होंगी? / The first rack of a shop has (18) bottles and each next rack has (3) more bottles. How many bottles are on the (9)th rack?

Correct Answer: B. (42). Explanation: बोतलों की संख्या समान्तर श्रेणी है। (a_9=18+8(3)=42)। / The number of bottles forms an AP. (a_9=18+8(3)=42).

Which concept should I revise for this Mathematics MCQ?

The number of bottles forms an AP. (a_9=18+8(3)=42).

What exam hint can help solve this Mathematics question?

बोतलों की संख्या समान्तर श्रेणी है। (a_9=18+8(3)=42)।