In the word 'PLANETARY', all odd-positioned letters (from the left) and vowels are changed to the immediately succeeding letter in the English alphabet, while remaining letters are changed to the immediately preceding letter. How many letters are repeated in the new arrangement?

Explanation

P(1-odd,cons)→Q | L(2-even,cons)→M | A(3-odd,vowel)→B | N(4-even,cons)→O | E(5-odd,vowel)→F | T(6-even,cons)→U | A(7-odd,vowel)→B | R(8-even,cons)→S | Y(9-odd,cons)→Z. New word: QMBOFUBSZ — no letter repeats. Answer: None. Day Person Subject Monday P Science Tuesday S History Wednesday Q Chemistry Thursday U English Friday T Hindi Saturday V Biology Sunday R Geography