22. Petra has three different dictionaries and two different novels on a shelf. How many ways are there to arrange the books if she wants to keep the dictionaries together and the novels together? PLZ HELP
THE ANSWER EITHER 24 OR 12 AND TELL ME THE WAY PLZ
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Solution :-
There are three different dictionaries and two different novels on a shelf. Petra has to arrange the books in a way that the 3 dictionaries are kept together and the 2 novels are kept together.
Number of ways to arrange 3 different dictionaries together = 3!
Number of ways to arrange 2 different novels together = 2!
Total number of ways to arrange 3 different dictionaries together and 2 different novels together = 3! × 2!
⇒ 3*2*1*2*1
= 12 ways
Answer.
There are three different dictionaries and two different novels on a shelf. Petra has to arrange the books in a way that the 3 dictionaries are kept together and the 2 novels are kept together.
Number of ways to arrange 3 different dictionaries together = 3!
Number of ways to arrange 2 different novels together = 2!
Total number of ways to arrange 3 different dictionaries together and 2 different novels together = 3! × 2!
⇒ 3*2*1*2*1
= 12 ways
Answer.
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