Erm, for the first one, somehow the question asked itself is eluding me, never mind the answer,..
For the second one, if theres 2 person there is 1+1 kisses, for 3 person theres 2+2+2 kisses ...for n people there will be n(n-1) kisses
To find for 190 kisses, u equate n(n-1)= 190
u get n = 14.293 .....u sure u copied the question correctly ??