With the same alphabet and conditions than exercise 2, the goal is now to indicate the letter that is missing in the gap (marked with a  ‘_’) for giving meaning to the series.

EXAMPLE :

a, c, _, c, a, c, …

A : ‘c’

B : ‘a’

C : ‘b’

D : ‘d’

E : ‘j’

The solution is 'B' because in this way we would have the regular series "a, c, a, c, a, c, …".
 

PROBLEM 1)

h, g, f, _, d, c, b, a, …

A : ‘a’

B : ‘e’

C : ‘f’

D : ‘c’

E : ‘b’
 

PROBLEM 2)

a, _, b, b, c, c, d, …

A : ‘a’

B : ‘b’

C : ‘z’

D : ‘c’

E : ‘d’
 

PROBLEM 3)

a, _, a, z, a, y, a, …

A : ‘x’

B : ‘z’

C : ‘a’

D : ‘b’

E : ‘y’
 

PROBLEM 4)

a, a, _, y, y, a, w, w, y, …

A : ‘x’

B : ‘c’

C : ‘a’

D : ‘f’

E : ‘g’
 

PROBLEM 5)

_, b, z, a, y, z, x, y, …

A : ‘a’

B : ‘w’

C : ‘b’

D : ‘z’

E : ‘y’
 

PROBLEM 6)

a, a, _, z, z, a, y, y, z,…

A : ‘a’

B : ‘w’

C : ‘b’

D : ‘z’

E : ‘y’
 

PROBLEM 7)

a, x, _, v, w, t, u, …

A : ‘z’

B : ‘w’

C : ‘y’

D : ‘v’

E : ‘a’
 

PROBLEM 8)

a, y, w, _, w, u, w, u, s, …

A : ‘z’

B : ‘w’

C : ‘y’

D : ‘v’

E : ‘s’
 

PROBLEM 9)

a, b, c, f, _, h, k, …

A : ‘g’

B : ‘f’

C : ‘h’

D : ‘i’

E : ‘a’
 

PROBLEM 10)

a, c, b, _, d, c, e, e, e, d, f, …

A : ‘a’

B : ‘b’

C : ‘e’

D : ‘c’

E : ‘d’
 

PROBLEM 11)

a, d, _, z, c, b, y, b, a, …

A : ‘c’

B : ‘b’

C : ‘e’

D : ‘y’

E : ‘z’
 

PROBLEM 12)

a, b, _, b, c, a, c, d, b, …

A : ‘c’

B : ‘d’

C : ‘b’

D : ‘a’

E : ‘z’
 

PROBLEM 13)

a, a, _, c, y, e, x, …

A : ‘g’

B : ‘d’

C : ‘x’

D : ‘e’

E : ‘z’
 

PROBLEM 14)

_, a, b, y, z, a, b, x, y, z, a, b, w, x, y, z, …

A : ‘a’

B : ‘z’

C : ‘b’

D : ‘y’

E : ‘c’
 

PROBLEM 15)

z, z, _, z, y, y, x, y, x, …

A : ‘a’

B : ‘x’

C : ‘z’

D : ‘y’

E : ‘v’