50. find -y lim (x,y)>(0,0) x-y (a) 0 (b) co (c) 1 (d) does not exist 51. find the repeated limit: lim lim m -x)1+ x) y0x0 (x+ y)(1+ y) (a) 0 (b) co (c) 1 (d) d

50. Find -y lim (x,y)>(0,0) x-y (A) 0 (B) co (C) 1 (D) Does not exist 51. Find the repeated limit: lim lim m -x)1+ x) y0x0 (x+ y)(1+ y) (A) 0 (B) co (C) 1 (D) Does not exist 52. Let P be a partition of [a, b], m be the lower bound of f in [la, b], L (P. ) lower sum off to the partition P. Then (A) m (b-a) = L (p,) (B) m (b-a)e L (p.) (C) m (b-a) s L (p,N (D) None of these 53. Let fdx and fdt be the upper and lower integrals offover [a, b_ the Darboux's condition of integrability is (A)fd = fdr B) rdr=- fd (D) None of these (C) 54 (x) dr means finding the: (B) area under the curve f from 0 (A) area of the left of I (D) None of these (C) arca to right of 0 (13) XE(H-3)-MAT(6)