Let g be a group with 15 elements. let l be a subgroup of g. it is known that l:g and that the size ofl is at least 4. the size of lis_

we know that by langrang th order of every subgroup is divisor of group of order. o(L)|o(G) o(L)|15 so o(L)= 1,3,5,15 but L≠G and L has atleast 4 elements so possible order is 5