UPI FROM KEYPAD MOBILE

Which of the following will come in place of the question mark (?) in the following letter series based on their positions in english alphabet? UPI ? ODP MBQ IAW

From the letters of the word 'MOBILE', if a letter is selected, what is the probability that the letter is a vowel?

If MOBILE is coded as DFBICE, then CHARGE is coded as :

If MOBILITY is coded as 46293927, then EXAMINATION is coded as