Fifty tickets, numbered consecutively 1 to fifty are placed in a box. what is the probability that in 4 separate drawing the following solutions occur? a) odd numbers, if replacement occurs. (b) odd numbers, if no replacement occurs (c) consecutive numbers of no replacement (d)consecutive numbers if replacement occurs

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

it is the most commonly accepted one