\(समुच्चय (A={x:x\) is a square number less than 20}) में कितने तत्व हैं?
\(How many elements are in (A={x:x\) is a square number less than 20})?
Explanation opens after your attempt
B. (4)
Concept
List the square numbers less than (20).
Why this answer is correct
(1,4,9,16) are four numbers.
Exam Tip
When a boundary is given, make the list and count. चरण 1: (20) से छोटे वर्ग संख्याएँ लिखें। चरण 2: (1,4,9,16) चार संख्याएँ हैं। चरण 3: सीमा दी हो तो सूची बनाकर गिनती करें।
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