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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 May 2008 17:45:56 IST
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Q.A number is chosen at random from{1,2,3,........1000}.Then the probability that n is a number which leaves a remainder 1 when divided by 7 is?
1.71/500
2.143/1000
3.72/500
4.71/1000
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The first Number between 1 to 1000........which when divided by 7 gives 1 remainder is 8......and the last one is 995.......so total such numbers are.....142.......using Arithematic Progression.......
and thus req.Probability = 142 / 1000 = 71 / 500........
~cheers.....
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
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5 May 2008 17:53:01 IST
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142/1000 = 71/500
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* "A Wish will not change anything, however a Decision will change everything"
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5 May 2008 17:53:03 IST
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obviously the answer is  
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6 May 2008 20:02:06 IST
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Find the number of numbers congruent to 1 mod 7. there are 143 such numbers as 1000/7 is 142.8666. so ans is 143/1000. BECAUSE 1 is also 1 mod 7.
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6 May 2008 20:47:23 IST
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143/1000
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Nitwit Blubber Odment Tweak
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6 May 2008 20:52:46 IST
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why does everybody in this forum post the same answer twice? mr.Computer001 you maybe a maths genius but it gives a bad impression to people who are seeing your post that you are copying from me...........dont dooooooo it!
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6 May 2008 20:58:59 IST
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@ above:
:D :D :D....
im very well known on this site...so no1 is gonna think im jobless enuf to copy from u...
i din look @ other posts...when i see a q i only look @ sandeep's posts...as i found a misatake i posted my answer...
cheers n all the best
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Nitwit Blubber Odment Tweak
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7 May 2008 14:35:42 IST
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you seem to know each other well
Sorry, i considered 1 but forgot 995
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7 May 2008 17:23:08 IST
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1000/7 = 142.857142
142*7=994
So there are 142 numbers which give the remainder 1 when divided by 7.
Hence, P = 142/1000
= 71/500
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7 May 2008 18:47:13 IST
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no thats wrong Cant you see whats been discussed before?
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