For two n-dimensional real vectors P and Q, the operation s(P, Q) is defined as follows:\(s\left( {P,\;Q} \right) = \mathop \sum \limits_{i = 1}^n \left( {p\left[ i \right].Q\left[ i \right]} \right)\)Let L be a set of 10-dimensional non-zero vectors such that for every pair of distinct vectors P, Q ∈ L, s(P, Q) = 0. What is the maximum cardinality possible for the set L ?

For two n-dimensional real vectors P and Q, the operation s(P, Q) is d

1.	For two n-dimensional real vectors P and Q, the operation s(P, Q) is defined as follows:\(s\left( {P,\;Q} \right) = \mathop \sum \limits_{i = 1}^n \left( {p\left[ i \right].Q\left[ i \right]} \right)\)Let L be a set of 10-dimensional non-zero vectors such that for every pair of distinct vectors P, Q ∈ L, s(P, Q) = 0. What is the maximum cardinality possible for the set L ?
A.	100
B.	10
C.	9
D.	11
Answer» C. 9