Suppose a simple group G of order 660 is a subgroup of the symmetric group S11 ( here S is with 11 as a subscript ) and x = {1,2,3,4,5,6,7,8,9,10,11}( a permutation like 1 goes to 2 and so on, I think ) in G. If P equals the span of x ( or ) determine the permutations which generate NGP ( here G is written as the subscript of N (the normalizer of P in G, I think).
Hint: if you know the order of the normalizer N of can you find the generators for N ?
Give a solid math argument why this is correct and please keep the answer as simple as possible at the same time.