What are the values of the sum?

Question

$\sum_{j \in S} 1$ where S = {1, 3, 5, 7}.

if we have $\sum_{j = 1}^{n} 1$ then the answer will be n. But what happens if this a set?

Answer 1

S = {1,2,3,4,5.......n }

Sum = 0;

 

while ( j in S)

{

      Sum = Sum +1

}

       j = j + 1

Return Sum ;

Answer will be 4.

 

Comments

answer of stackexchage is 4, and your answer is 16.. I've read all comments. But which one is correct..??

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@Digvijay Sorry. Your first code was correct. We can just translate

$\sum_{j \in S} 1$

to

for each element in $S$ add 1- so this counts the number of elements in $S$. Stackexchange answer is correct.

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yes it is counting no of element in the set. Answer will be 4