31. the value of || [x+y]dr dy, where x +y 1s the greatest integer less than or equal toxty and dis the region bounded by x = 0, y=0 d 0 and x+y=2, is 3 (a) (b)

31. The value of || [x+y]dr dy, where x +y 1s the greatest integer less than or equal toXty and Dis the region bounded by x = 0, y=0 D 0 and x+y=2, is 3 (a) (b) 2 2 (d) 0 (c)