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#1 2011-12-19 04:10:24
- juantheron
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- Registered: 2011-10-19
- Posts: 312
middle one is perfect square
find three digit numbers in which the middle one is a perfect square are formed using the digits 1 to 9
and also find sum of their digits
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#2 2011-12-19 04:53:20
- TheDude
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- Registered: 2007-10-23
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Re: middle one is perfect square
I don't understand the question. Are you asking us to find all of the three digit numbers where the middle digit is a perfect square? Like 142, the middle digit 4 is a square, is that what you need?
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#3 2011-12-19 05:14:26
- juantheron
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Re: middle one is perfect square
yes you are saying right
Are you asking us to find all of the three digit numbers where the middle digit is a perfect square? Like 142, the middle digit 4 is a square
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#4 2011-12-19 05:45:02
- anonimnystefy
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- From: Harlan's World
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Re: middle one is perfect square
hi juantheron
when you wanna quote someone you should use
tags.second of all,there are 9*4*10=360 numbers satisfying the conditions.
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Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
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#5 2011-12-19 05:54:27
- TheDude
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Re: middle one is perfect square
He said using digits 1-9, so it would be 9*3*9 = 243 numbers. Also juan, when you say you want to find the sum of their digits, do you mean the total sum of the digits of all 243 of those numbers?
Last edited by TheDude (2011-12-19 05:54:49)
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#6 2011-12-19 06:00:15
- anonimnystefy
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Re: middle one is perfect square
hi TheDude
didn't see that.yes there are 243 such numbers.
hi juantheron
if it's like thedude said sum of digits of all those numbers together then it's:
81*1+81*4+81*9+27*45+27*45=3564 ... if i calculated it correctly 
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#7 2011-12-19 15:20:15
- juantheron
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- Registered: 2011-10-19
- Posts: 312
Re: middle one is perfect square
thanks to all
can any one explain me how can i get such no.
and their sum
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#8 2011-12-19 20:41:45
- Bob
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- Registered: 2010-06-20
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Re: middle one is perfect square
hi juantheron
This question seems very odd. There are too many answers. 
Are you sure you have written it correctly?
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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