किसी सर्वे में (160) लोगों में (92) मोबाइल, (78) लैपटॉप और (51) दोनों रखते हैं। ठीक एक उपकरण रखने वाले कितने हैं?
In a survey of (160) people, (92) have a mobile, (78) have a laptop and (51) have both. How many have exactly one device?
Explanation opens after your attempt
A. (68)
Concept
Exactly one is ((92-51)+(78-51)=68). People having both are not counted in exactly one.
Why this answer is correct
The correct answer is A. (68). Exactly one is ((92-51)+(78-51)=68). People having both are not counted in exactly one.
Exam Tip
ठीक एक (=(92-51)+(78-51)=68) है। दोनों रखने वालों को ठीक एक में नहीं गिना जाता।
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