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In an entrance test there are multiple choice questions, there are four options for each question, of which only one is correct. The probability that a student knows the answer of a question is 90%. If he gets the correct answer to a question, then what is probability that he was guessing?
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#nda1 2026 probability questions

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00:00Yeah, I have a question that I have given a test,
00:03or an exam in zip.
00:05MCQ type exam.
00:07Four options of exam.
00:09And a student,
00:11he has a question of answer.
00:13He has a probability of 90%
00:15and his probability of 10%
00:19We have given a question of answer,
00:23which is right.
00:25Or he has asked,
00:26which is the probability of the answer.
00:29So, probability is equal to favorable outcome upon total outcome.
00:35Favorable outcome,
00:36yarni ki,
00:37उसने तुक्का लगाया हो.
00:38To तुक्का लगाने की probability क्या है?
00:4190% उस्ते आने के,
00:43yarni ki, 10% उस्ते नहीं आने की.
00:45To फिर बाद में,
00:4610 by total percent कितनी है?
00:49100.
00:50Yarni ki, 10 by 100 into
00:53तुक्का लगाने की,
00:54yarni ki, guess कहने की probability.
00:56Guess किया हो,
00:58और सही,
00:58by.
00:59Yarni ki,
01:004 option में से,
01:01किसी भी A के सही होने की probability,
01:031 by 4.
01:05First case A true,
01:07फिर बाद में case B true.
01:09इस इन टाइप की cases में,
01:11हम इन probability को multiply करते.
01:14A की probability multiplied by B की probability.
01:16For example,
01:18कि A B होकर हो,
01:19और B B,
01:20ऐसे cases में probability multiply होते है,
01:23centrally.
01:25अब इससे divided by,
01:27इससे simplify करेंगे,
01:29तो यह 10 upon 100 बन जाएगा,
01:301 upon 10 into 1 upon 4.
01:32टोटल आउटकम,
01:34तो answer इसने यह तो बताई रिया है कि correct है,
01:37तो फिर बाद में correct होने की probability है,
01:40पहला कि उससे अंसर आजा था,
01:429 by 10 plus,
01:44दूर्जा उसने तुक्का लगाया,
01:46फिर बाद में correct हो गया,
01:48तो फिर बाद में यह हो गया,
01:49टोटल आउटकम जितमे answer correct है,
01:52तो फिर बाद में probability आ जाएगी,
01:541 upon 40 divided by इससे एड़ किया हो,
01:589 upon 10 plus 1 upon 40,
02:02LCM लेके solve करेंगे,
02:041 upon 40 divided by 9,
02:084,36 plus 1,
02:0937 upon 40,
02:12इससे यह cancel हो गया,
02:13यानि कि यह आगे,
02:141 upon 37 probability हमारा answer,
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