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find out the number.

This is a discussion on find out the number. within the Brainteasers forums, part of the Brain Gym category; Consider the following triangular arrangement of numbers. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 • • • • • • The middle number of the 51st row is? -- ...

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#1 (permalink)   09-17-2006

jamesravid Expert Member   Join Date: Jun 2006 Location: India Posts: 411 Thanks: 15 Thanked 33 Times in 25 Posts

find out the number. Consider the following triangular arrangement of numbers. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 • • • • • • The middle number of the 51st row is? -- James.

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#2 (permalink)   10-25-2006

jamesravid Expert Member   Join Date: Jun 2006 Location: India Posts: 411 Thanks: 15 Thanked 33 Times in 25 Posts

Re: find out the number. -- Answer It is obvious that line 'n' ends with the number n*(n+1)/2. ( line 2 ends with 2*3/2=3 line 3 ends with 3*4/2=6 and line 4 ends with 4*5/2=10) Therefore line 50 will end with the number 50*51/2 =1,275 middle number in the 51st row is the 26th number in the row. Hence Middle number in the 51st row is 1,275 +26 = 1,301. -- James.

#3 (permalink)   01-24-2007

vaniPrabhakar Junior Member   Join Date: Jan 2007 Location: india Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts

Re: find out the number. the middle no of 51 st row is 197

#4 (permalink)   01-24-2007

toughrookie Junior Member   Join Date: Jan 2007 Location: Bangalore Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts

Re: find out the number. is it 1300

#5 (permalink)   01-24-2007

vmshenoy Expert Member   Join Date: Oct 2005 Location: india,cochi,bangalore Posts: 395 Thanks: 2 Thanked 8 Times in 7 Posts

Re: find out the number. i think it is 1301! James ravid please verify this! bye __________________ :) NEVER SAY DIE.

#6 (permalink)   01-24-2007

Manojks Expert Member   Join Date: Jan 2007 Location: Bangalore Posts: 252 Thanks: 4 Thanked 8 Times in 7 Posts

Re: find out the number. Yeah i too think the answer is 1301... Thanks Manoj

#7 (permalink)   01-25-2007

smart_coder Expert Member   Join Date: Jan 2007 Location: Pune Posts: 279 Thanks: 6 Thanked 4 Times in 4 Posts

Re: find out the number. and I confirm it wud b 1301

#8 (permalink)   01-25-2007

kalayama Expert Member   Join Date: Sep 2006 Location: Bengalooru (Formerly called Bangalore), India Posts: 486 Thanks: 2 Thanked 28 Times in 27 Posts

Re: find out the number. Please check this Quote: Re: find out the number. -- Answer It is obvious that line 'n' ends with the number n*(n+1)/2. ( line 2 ends with 2*3/2=3 line 3 ends with 3*4/2=6 and line 4 ends with 4*5/2=10) Therefore line 50 will end with the number 50*51/2 =1,275 middle number in the 51st row is the 26th number in the row. Hence Middle number in the 51st row is 1,275 +26 = 1,301. -- James. James had already given answer. (Second post in the thread) Cheers! Kalayama __________________ [COLOR="Blue"][SIZE="2"]"If you are not living on the edge of your life, you are wasting space"[/SIZE][/COLOR] Someone says "Impossible is nothing". The man next him says "Let me see you licking your elbow tip!"

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