Directions: In each of the following questions, find out which of the letter series follows the given rule.
Number of letters skipped in between adjacent letters in the series is two. 

b_ac_cc_cb_ab_ac 

Arrange the given words in the sequence in  which they occur in the dictionary.
1. First
2. Frown
3. Fist
4. Fast
5. Floor

If ’’624739854’’ 1 is added to all the even number and 1 is subtract from all the odd number, then what is the sum of the digits which is fifth from the left end and fourth from the right end?

From the given alternative words, select the word which cannot be formed using the letters of the given word:
PHOTOSYNTHETIC

Direction: Study the following arrangement carefully and answer the given question below. 

S D 9 5 E # K 6 T I 8 P 1 % A 2 C λ L M U3 W @ N 4 © J $ 7 F B 

If all the symbols are dropped from the above arrangement, which of the following will be the 5th to the left of 12th element from right end?

In the word ‘BRISKLY’, how many pairs of the letters have the same number of letters between them in the word as in alphabet?

BDF, ? , PRT , WYA