शब्द KNOWLEDGE में (आगे और पीछे दोनों दिशाओं में) अक्षरों के ऐसे कितने जोड़े हैं, जिनके बीच उतने ही अक्षर हैं जितने कि अंग्रेजी वर्णमाला में होते हैं?

Evaluate the given expression by using the standard alphabetical positions of the letters (A=1, B=2, etc.), and find the letter corresponding to the final result: (B × 2) + (E ÷ 1) - A

This question is based on the following words: SUN, RAT, HIT, BEG. In each of the words, each vowel is changed to the letter immediately following it in the English alphabetical order and each consonant is changed to the letter immediately preceding it in the English alphabetical order. In how many letter-clusters thus formed, will no vowel appear?