rrb group d preparation|rrb group d motivation|group d|railway|#shorts #motivation

A group of 10 observations has mean 5 and 2sqrt(6) another group of 20 observationshas mean 5 and S.D.3sqrt(2) ,then the S.D.ofcombined group of 30 observations is

Number of groups in d-block

A boy has the blood group AB. What is true of the inheritance of this blood group in his case ? (a) His parents should be one with O group and the other with B group. (b) His father should be with A group and mother with B group. (c ) His parents should be one with O group and the other with A group. (d) Both his parents should be with B group.

Preparation OF alcohol by Reaction OF Various Functional Group

Which group elementof d-block do not form hydride at all?