जॉइन Examsbookउत्तर : 1. "3"
A man wears socks of two colours - Black and White. He has altogether 30 black socks and 10 brown socks in a drawer. Supposing he has to take out the socks in the dark, how many must he take out to be sure that he has a matching pair ?5
प्र: A man wears socks of two colours - Black and White. He has altogether 30 black socks and 10 brown socks in a drawer. Supposing he has to take out the socks in the dark, how many must he take out to be sure that he has a matching pair ?
- 13true
- 24false
- 35false
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उत्तर : 1. "3"
व्याख्या :
Answer: A) 3 Explanation: Given there are 2 coloured socks, which is black and White Let suppose 3 is choosen at random then three conditions arises 1. all are black2.all are white3. either it will have 2 black and 1 white or it will have 2 white and 1 black so in all the conditions as above mentioned we are getting atleast one pair of socks. So, he must take out 3 to be sure that he has a matching pair.
समान प्रश्न
Since Nithya and Suganya exchange places, so Rita’s new position is the same as Monika’s earlier position. This position is 17th from the right and 10th from the left. Therefore Number of girls in the row = (16 + 1 + 9) = 26.