A three-lettered word is to be formed from the letters of the English alphabet. If the first and the last letter of the word are different vowels and the middle letter is a consonant, then in how many ways can the word be formed?
ATQ, There are 21 consonants and 5 vowels in the English alphabet. Number of ways to choose the first letter (vowel) 5C1 = 5 Number of ways to choose the second letter (consonant) = 21C1 = 21 Number of ways to choose the third letter (different vowel) = 4C1 = 4 (Since it must be different from the first vowel) Hence total number of ways = 5 × 21 × 4 = 420 ways
6, 5, 40, 32, 249, 240
1 4 13 46 ? 976
...Direction: Which of the following will replace ‘?’ in the given question?
2, ‘?’, 46, 136, 311, 605, 1086
1930 1805 1589 1246 734 ?
...14 8 6 4 7 8.5
...45 67 111 199 ? 727
73920, 9240, ?, 220, 44, 11
Find the wrong number in the given series.
12, 18, 27, 42, 62, 87
A series is 11, 20, 42, 82, 166, 330
If another series 4, a, b, c, d, 106 follows the same pattern as the given number series, then find the app...
8 6 2 ? -1 9.5
...
