Thickness of 8 tyres L, M, N, O, P, Q, R and S is compared. Thickness of no two tyres is same. Thickness of N Is more than L but less than 6 tyres. Thickness of O Is more than M but less than Q. Thickness of P is less than only two tyres. Thickness of Q is not more than P. Which of the following statement is not correct? ​​

Given: 

Thickness of 8 tyres L, M, N, O, P, Q, R and S is compared.

Thickness of no two tyres is same.

Thickness of N Is more than L but less than 6 tyres.

Thickness of O Is more than M but less than Q.

Thickness of P is less than only two tyres.

Thickness of Q is not more than P.

Case I: R > S > P > Q > O > M > N > L
Case II: S > R > P > Q > O > M > N > L

Thickness of R is less than S statement is not correct. 

Because is there R is less than S is not define.

Thus, correct option is (b).