In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
c_e_cd_f_d_f

Directions: From the given alternative words, select the word which can be formed using the letters of the given word.

HETEROGENOUS 

Directions. Read the following information carefully and answer the questions given below it:
Seven boxes are placed on one above another in the stack formation. Box N is kept immediately below V. Three boxes are placed between N and L. Only two boxes are kept between L and M. S is kept at one of the positions above M. More than three boxes are kept between S and K. B is kept immediately above K.

Which box is kept at the top position?

Direction: In the following question, select the related letters from the given alternatives. 

LEFT : NGHV :: RIGHT : ?

If "P" denotes "multiplied by", "R" denotes "subtracted from", "S" denotes "added to" and "Q" denotes "divided by", then which of the following equation is true?

365 : 90 : : 623 : ?

Pointing towards a lady, a boy says, “She is the daughter of the woman who is the mother of the husband of my mother”. How is the lady related to the boy?

Choose the option figure in which the problem figure is hidden/embedded.