Puzzle time! - Page 23
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Thread: Puzzle time!

  1. #221
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    Quote Originally Posted by Raji Ram View Post
    What is 62(1+2) = ? The Correct Answer Explained - YouTube


    So this video proves that I am historical!!
    I too got the same result. I guess we are dinosaurs.
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    Quote Originally Posted by prasad1 View Post
    I too got the same result. I guess we are dinosaurs.
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  4. #223
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    Here are a few more along the same lines. What are the values of

    a) 2-3+4
    b) 2-3-4
    c) 223
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  6. #224
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    what is the value of
    (1+9-46*7)3285
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  8. #225
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    Sorry for being pedantic

    I looked at the video given in post https://www.tamilbrahmins.com/showth...084#post385084. That is not the way a value of an expression is computed. The order of evaluation is always left to right according to the operator precedence.

    So in 6/2*(1+2) since / and * are the same precedence 6/2 is evaluated first giving 3. Now next two operators * and + , plus inside parenthesis, so 1+2 is evaluated next and finally the results of the first two operations are multiplied. Postfix notation (what the pocket calculator does) for this expression is 6, 2, / ,1 ,2 ,+ ,*


    Answers to my questions in post https://www.tamilbrahmins.com/showth...150#post385150

    a) 3 ( 2,3,-,4,+)
    b) -5 (2,3,-4, -)
    c) 256 (2,2,3,^,^) - Exponentiation (operator ^) is right associative - you go from right to left - so 23 is evaluated first to 8 then 28 is evaluated next to get 256.

    For details on associativity of operators please see https://en.wikipedia.org/wiki/Operator_associativity

    Answer to https://www.tamilbrahmins.com/showth...151#post385151
    is roughly 2.71 (value of e) - to see this note 46*7 is evaluated first to 442.
    Since 4 = 22. Hence 442 becomes 284. next 9-284 becomes
    1/9284. Since 9=32 that expression becomes 1/3285.

    So the expression is of the form (1+1/n)n where n =3285
    Since n is very large, from your calculus 1, we know that it becomes Euler's number e = 2.71...
    ( https://en.wikipedia.org/wiki/E_(mathematical_constant) )
    By the same token the value of (1.001)1000 will be approximately 2.71 (verified here http://www.wolframalpha.com/input/?i=1.001%5E1000 )
    Going back in the past the question I raised (two years ago ) here https://www.tamilbrahmins.com/showth...655#post311655 (You have to mouse over to get the puzzle )- what is the value of 0.999 1000 will be approximately 0.367 which is 1/e (verified here http://www.wolframalpha.com/input/?i=0.999%5E1000 )
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  10. #226
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    Quote Originally Posted by mskmoorthy View Post
    ....... I looked at the video given in post https://www.tamilbrahmins.com/showth...084#post385084. That is not the way a value of an expression is computed. The order of evaluation is always left to right according to the operator precedence......

    Answers to my questions in post https://www.tamilbrahmins.com/showth...150#post385150

    a) 3 ( 2,3,-,4,+)
    b) -5 (2,3,-4, -)
    c) 256 (2,2,3,^,^) - Exponentiation (operator ^) is right associative - you go from right to left - so 23 is evaluated first to 8 then 28 is evaluated next to get 256. ........
    Dear Prof. Sir,

    Thanks for the explanation. I got the correct answers.

    But, after seeing the video I thought the answer to a) and c) might be wrong!!

    Hence I waited for you to reply. So, even dinosaur can do good math!

    BTW, my guess was this - confused by the video:

    Answer for Q a) 2-3+4 might be 3 + 4 = 7; 2 - 7 = - 5 !! (Addition first and subtraction next - BODMAS)

    Answer for Q c) might be (using the left to right rule) 2 ^ 2 = 4; 4 ^ 3 = 64 !!
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