Комбинаторика. Задача по комбинаторике

Complete the conversation using the correct form of the verbs in brackets. Bipun: Hi, Atul. Good to see you again. ________ 1 (you/give) the keynote speech? Atul: No, I________ 2 (not/do) that. I________ 3 (just/lead) a workshop. Bipun: Oh, really? I ________ 4 (work) on the exhibition stand this morning, but I ________ 5 (not/plan) to be here after 1 p.m. ________ 6 (you/do) anything at lunchtime? Atul: Not really. Let’s meet up. Bipun: Sure. Anyway, who ________ 7 (you/work) for these days? Atul: I’m still at Xcom, although 1________ 8 (not/manage) the same project any more. I ________ 9 (now/run) a project to develop new DVD-based toys. The company ________ 10 (face) increased competition, so who knows how long I’ll be there! Bipun: It’s the same for me. We ________ 11 (not/sell) as many TV games as we used to. The market ________ 12 (change), but the company ________ 13 (not/keep) up with these changes.

Составьте все подмножества а) множества K={4,9} б) множества L = {1,3,7}, в) множества M= {a,b,c,d}