How many balls??

[GeoG]

Easy way
Don't count them as squre
Count them in rows and add up
you will never get wrong answer.

 

[ali-raj]

0000
000
00
0

10 in base,
6 on second
3 on third
1 on top

20 total in that case

you are wrong about base. plz check again. 10 isn't possible.

 

[stranger]

you are wrong about base. plz check again. 10 isn't possible.

http://www.texample.net/weblog/2011/dec/09/triangular-numbers/

have a look on all the examples...... ;)

Peace

 

[ali-raj]

http://www.texample.net/weblog/2011/dec/09/triangular-numbers/

have a look on all the examples...... ;)

Peace

yes you are right. i was wrong. was missing center ball.

 

[pk413121]

what if it is a triangle pyramid ;)

آپ پہلے یہ تو سمجھ لیں آگے کے سبق بعد میں

 

[abdlsy]

Two of course!

 

[stranger]

آپ پہلے یہ تو سمجھ لیں آگے کے سبق بعد میں

aap ki his-e-mazah wakai 99 years wali hai ;)

 

[KhanaBadosh2014]

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