dse 2006 q 45

[pbansal]

Can someone tell y the answer is leaves unchanged and is it any different for large open economy
Also if some1 could tel q 49

[Do bats eat cats?]

49. P(At least one joke was not told in previous class)
     = 1 - P(Both jokes were told in previous class)
     = 1 - 2C2/6C2
     = 28/30