Fibonacci pattern

#1

https://ide.geeksforgeeks.org/cfzZC1Q6MT
code link
https://online.codingblocks.com/app/player/11915/content/54864/4779/code-challenge
question link
why is my code not running

#2

hello @anitagupta1411
image
what u r trying here.
i think it should be
i*(i-1)/2 +j

#3
#4

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