Inserting The Missing Character Questions

Select the missing letter from the given responses?

Select the odd figure out of the follwing figure series.

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

d_ba_c_a_cb_

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

KK_LL_K_L_LL

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
dem, fgo, hiq, _______

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

M_N_M_MR_R_N

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

_d_be_c_ed_b

In the following question, by using which mathematical operators will the expression become correct?
15 _ 3 _ 4 _ 20