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 ; Calculate 2 ^ n ; Driver Code
< ? php function calculateSum ( $ n ) { $ sum = 0 ; $ sum = 1 << $ n ; return ( $ sum - 1 ) ; } $ n = 10 ; echo " ▁ Sum ▁ of ▁ all ▁ elements : " , calculateSum ( $ n ) ; ? >