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
B. (42)
Concept
The number of bottles forms an AP. (a_9=18+8(3)=42).
Why this answer is correct
The correct answer is B. (42). The number of bottles forms an AP. (a_9=18+8(3)=42).
Exam Tip
बोतलों की संख्या समान्तर श्रेणी है। (a_9=18+8(3)=42)।
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