91Ó°ÊÓ

A man has 4 sons. There are 6 proposals of marriage for his sons. In how many ways can they select a proposal for their marriages, such that none of them marry with more than one girl? (a) 180 (b) 270 (c) 360 (d) none of these

In how many ways can 4 books be arranged out of 16 books on different subjects? (a) 34650 (b) 43680 (c) 43890 (d) none of these

How many 6 digit numbers can be formed using the digit 2 two times and the digit 4 four times? (a) 16 (b) 15 (c) 18 (d) 24

If the letters of the word VERMA are arranged in all possible ways and these words are written out as in a dictionary, then the rank of the word VERMA is : (a) 108 (b) 117 (c) 810 (d) 180