The number of words, with or without meaning, that can be formed by taking 4 letters at a time from the letters of the word 'SYLLABUS' such that two letters are distinct and two letters are a like, is _________.
If the line, 2x – y + 3 = 0 is at a distance
hen the sum of all possible values of is_
Ans : 30
Sum of all values of = 30
Four fair dice are thrown independently 27 times. Then the expected number of times, at least two dice show up a three or a five, is _______