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There are five different roads connecting Agra and Delhi. In how many ways a person can complete his journey if he goes from Agra to Delhi by one road and returns by another road ?
1. 9
2. 10
3. 15
4. 20

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Correct Answer - Option 4 : 20

सड़कों की संख्या जिसके द्वारा वह दिल्ली जा सकते हैं = 5

सड़कों की संख्या जिसके द्वारा वह दिल्ली से आगरा = 4 पर लौट सकते हैं

(चूंकि यह दिया गया है कि वह उसी सड़क से वापस नहीं आ सकता)

इस प्रकार, संभावनाओं की कुल संख्या = 5 × 4 = 20

इसलिए, 20 सही है।

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