Question
How many four-letter words without repetition having
exactly two vowels can be formed by using the letters of the word "MISTAKE"?Solution
"MISTAKE" 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
Direction: Which of the following will replace ‘?’ in the given question?
5, 18, ‘?’, 126, 296, 586, 1044
5 ? 205 823 7405 29623
8   24    12    ?   18     54
15 12 5 ? -21 -40
...Direction: Which of the following will replace ‘?’ in the given question?
342, ‘?’, 420, 462, 506, 552, 60
There are three series given below which are following with the same pattern.
Series I: 21, 44, 135, 544, 2725
Series II: 14, B, C, D, E
51     53     109     332     ?     6686
...A series is 2100, 3431, 2431, 3160, 2648, 2991
If another series 1728, __, __, __, __, p, follows the same pattern as the given number series, th...
8 9 22 75 316 ?
...21 11.5 13 ? 45.5 116.75
...
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