What do you call a person who studies the elections and

If H < T < B = Y and T = V < Z < C, then which of the following conclusions is correct?

Select the number from among the given options that can replace the question mark (?) in the following series.

86, 74, 62, 54, ?, 42, 38

Complete the following series:

Mhz, Ngy, Ofx, Pew, ?

Read the given statements and conclusions carefully. Decide which of the given conclusions is/are true based on the given statements

Select the option that represents the letters that, when placed from left to right in the following blanks, will complete the letter-series.

Select the figure from the options that can replace the question mark (?) and complete the pattern.

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. 

xy_z_xxy_zbx_yx_bx_y_z_x

A cube is made by folding the given sheet. In the cube so formed, which pair of letters will be on the opposite faces?