In how many ways can 3 books on Hindi and 3 books on English be arranged in a row on a shelf, so that not all the Hindi books are together ?

In how many ways can 21 books on English and 19 books on Hindi be placed in a row on a shelf so that two books on Hindi may not be together? (A) 770 (B) 385 (C) 1540 (D) 399

In how many ways can 21 books on English and 19 books on Hindi be placed in a row on a shelf so that two books on Hindi may not be together? (A) 770 (B) 385 (C) 1540 (D) 399

In how many ways can 10 books on English and 8 books on physics be placed in a row on a shelf so that two books on physics may not be together?

In how many ways can 19 indentical books on English and 17 identical books on Hindi be placed in a row on a shelf so that two books on Hindi may not be together ?

In how many ways can 4 books of math and 3 books of English and 5 books of sociology be arranged on a shelf so that (a) same subject are together (b) only sociology books are kept together (c) only English books are kept together

In how many ways 7 books can be arranged from 10 books?

In how may ways can 15 identical books of mathematics and 12 identical books of physics be placed in a row on a shelf so that tow books of physics may not be together ?