Which of the following group is present in animal cells ?
(A) Mitochondria, Cell membrane, Cell wall, Cytoplasm
(B) Chloroplast, Cytoplasm, Vacuole, Nucleus
(C) Nucleus, Cell membrane, Mitochondria, Cytoplasm
(D) Vacuole, Cell membrane, Nucleus, Mitochondria
The harmonic mean H of two numbers is 4 and the arithmetic mean A and geometric mean G satisfy the
equation 2A + G^2 = 27. The two numbers are
(a) 6, 3 (b) 9, 5 (c) 12, 7 (d) 3, 1