DOES ANY ONE KNOW THE PROCEDURE7. A friend comes to other and says can u do me a favour pick letters randomly from the stack such that all the letters that u pick are 5% of the total letters. The other friend while sorting just picked up letter number one, missed one, picked up another letter, missed two picked one letter ,missed three, picked another letter, and so on...till he picked last letter to his amazement he found that the picked up letters were 5% of the total letters in the stack. How many letters did he pick? Ans: 39

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tulasij
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Feb 10th, 2006
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Sucheta

Mar 31st, 2006

1 2 3 4 5 6 7 8 9 10 ??
1 2 3 4 ??..

as shown above, he will pich cards. Now the sum of cards wii b n(n+1)/2 in the upper series and n will represent the card being piched up.

According to given condition, n(n+1)/2 * 0.05 = n
So on solving we get n=39.