Sum of all elements up to Nth row in a Pascal triangle | Function to find sum of all elements upto nth row . ; Initialize sum with 0 ; Loop to calculate power of 2 upto n and add them ; Driver Code
< ? php function calculateSum ( $ n ) { $ sum = 0 ; for ( $ row = 0 ; $ row < $ n ; $ row ++ ) { $ sum = $ sum + ( 1 << $ row ) ; } return $ sum ; } $ n = 10 ; echo " ▁ Sum ▁ of ▁ all ▁ elements ▁ : ▁ " . calculateSum ( $ n ) ; ? >