Answer Happy

Statistic, can u help i need to be first to answer this
question for extra credit.
I'll up vote immediately tnx in advance
Question 6 Four married couples, Mr. and Mrs. Koo, Mr. and Mrs. Li, Mr. and Mrs. Mew, and Mr. and Mrs. Ng are to be seated at a round table for dinner. How many different arrangements are there if (a) the four couples are seated where no two men sit together? [5 marks] (b) another couple, Mr. and Mrs. Yeoh, suddenly join in and the ten people are rearranged so that Mr. and Mrs. Yeoh sit side-by-side and all the women sit together? [ 5 marks)