Consider a database that has the relation schema Random(A, B, C). An instance of the schema Random is as given below.

A	B	C
10	10	7
10	7	10
7	10	7
10	7	7
10	13	7
13	10	7
10	7	13
10	2	7

 

Tuple calculus expression for the above instance is given as  {t.B | t ϵ r ∧ (t[A] = 10  ∧ t[C] = 7)}

What is the sum of the elements in the output row of the given expression?