Question
History books are never together.
In how many ways 5 History books and 7 geography books can be arranged in a row so that :Solution
No. of when History books are always together = 5! × 8! Total no. of ways when all the books are arranged without any condition = 12! No. of ways when History book are never together = 12! – (5! × 8!)
84, 97, ?, 162, 214, 279
In each of the following number series, one term is missing. Find the missing term.
4, 9, 16, 25, 36, ?
71, 79, 88, 152, ?, 393
What will come in place of (?) question mark in the given number series.
12, 27, 44, 65, ?, 139
4    11     22     ?      56    79    106
...- What will come in place of the question mark (?) in the following series?
1, 9, 35, 91, 189, ? 15.5, 62, 186, ?, 2232, 8928
600 Â Â Â 60Â Â Â 12Â Â Â ? Â Â Â Â 1.44Â Â Â Â 0.72
9    14    38    129    ?   2705   16260
...In each of the following series, one term is missing. Find the missing term.
2, 5, 11, 23, 47, ?
