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A person writes a letter to four of his ...

A person writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with instruction that they move the chain similarly. Assuming that the chain is not broken and that it costs `50` paise to mail one letter. Find the amount spend on the postage when 8th set of letter is mailed.

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To solve the problem step by step, we need to analyze how the letters are sent and calculate the total amount spent on postage when the 8th set of letters is mailed. ### Step 1: Understand the Pattern of Letter Sending The first person sends letters to 4 friends. Each of these friends then sends letters to 4 new people. This creates a pattern where the number of letters sent grows exponentially. ### Step 2: Calculate the Number of Letters Sent in Each Set - **1st set**: The first person sends 4 letters. - **2nd set**: Each of the 4 friends sends 4 letters, so the total is \( 4 \times 4 = 16 \). ...
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Statement 1: There are 4 addressed envelopes and 4 letters for each one of them. The probability that no letter is mailed in its correct envelops is 3/8. Statement 2: The probability that all letters are not mailed in their correct envelope is 23/24.