With the same alphabe and condition than the other exercises, now we have two series and the goal is to fill the gap of the second series with regard to the first series.
 

EXAMPLE 1: k7

a, z, y, x, …

m, _, k, j, …

A : ‘o’

B : ‘g’

C : ‘l’

D : ‘m’

E : ‘p’

The solution is ‘C’ by following the trend of decrement of the first series.
 

PROBLEM 1)

y, y, w, w, u, u, …

m, m, _, k, i, i, …

A : ‘k’

B : ‘h’

C : ‘f’

D : ‘l’

E : ‘g’
 

PROBLEM 2)

a, z, x, w, u, t …

m, l, _, i, g, d, …

A : ‘i’

B : ‘n’

C : ‘l’

D : ‘j’

E : ‘g’
 

PROBLEM 3)

z, b, z, z, z, z, b, z, z, z, z …

z, z, z, z, _, z, z, z, z, z, z, …

A : ‘z’

B : ‘b’

C : ‘y’

D : ‘x’

E : ‘a’
 

PROBLEM 4)

y, z, b, z, a, c, a, b, …

k, l, _, l, m, o m, n, …

A : ‘p’

B : ‘r’

C : ‘m’

D : ‘q’

E : ‘n’
 

PROBLEM 5)

a, y, y, z, x, x, y, …

m, k, k, _, j, j, k, …

A : ‘n’

B : ‘m’

C : ‘l’

D : ‘z’

E : ‘o’
 

PROBLEM 6)

a, b, c, d, e, …

z, y, x, _, v, …

A : ‘r’

B : ‘w’

C : ‘v’

D : ‘s’

E : ‘o’
 

PROBLEM 7)

b, c, b, z, a, b, a, b, c, b, z, a, b, …

n, o, n, o, p, _, p, q, p, q, r, q, r, …

A : ‘n’

B : ‘o’

C : ‘p’

D : ‘q’

E : ‘r’
 

PROBLEM 8)

a, w, s, o, k, g, …

_, i, e, a, w, s, …

A : ‘a’

B : ‘m’

C : ‘p’

D : ‘w’

E : ‘e’

PROBLEM 9)

w, x, t, u, q, r, n, …

i, j, _, g, c, d, z, …

A : ‘t’

B : ‘f’

C : ‘g’

D : ‘k’

E : ‘e’
 

PROBLEM 10)

a, a, b, a, a, m…

b, b, _, b, b, n…

A : ‘c’

B : ‘a’

C : ‘m’

D : ‘n’

E : ‘b’