5. 96 , 55,26,13, __
4. How many such pairs of letters are there in the word NECESSARY which have as many letters between them in the word as in English alphabet
3. Which letter is exactly midway between A and K?
2. If SERVICE = R5QU3B2 , then ACID= ?
1 . If C=3 , CAT = 72 , then BACK = ?