1 . If C=3 , CAT = 72 , then BACK = ?
2. If SERVICE = R5QU3B2 , then ACID= ?
3. Which letter is exactly midway between A and K?
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
5. 96 , 55,26,13, __