Question
How many four-letter words without repetition having
exactly two vowels can be formed by using the letters of the word "SEMINAR"?Solution
"SEMINAR" has 4 consonants and 3 vowels.
Number of ways to select the letters = 3C2 × 4C2 = 3 × 6 = 18
Arrangements of 4 letters = 4! = 24
Total number of words formed = 18 × 24 = 432
58   83   133   ?    308    433
What will come in place of the question mark (?) in the following series?
112, 116, 121, ?, 134, 142
7    12    34    117    ?   2465   14820
...What will come in place of the question mark (?) in the following series?
206, 187, ?, 157, 146, 139
18, 21, 45, 138, 555, ?
What will come in place of the question mark (?) in the following series?
92, 153, 220, ?, 364, 443
32, 42, 62, 92, ?, 182
728, 737, ?, 778, 814, 863Â
150, 158, 131, 195, 70, ?Â
114, 146, 210, 306, 434, ?
