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1)How many perfect squares are there between 20 and 150?

2)How many ways can we put 3 math books and 5 English books on a shelf if all the math books must stay together and all the English books must also stay together? (The math books are all different and so are the English books.)

T-T i cant do it :(

 Jun 15, 2021
 #1
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1. There are seven perfect squares between 20 and 150.

 

2. There are 3!*5! = 720 ways to arrange the books.

 

Hope this helps!

 Jun 15, 2021
 #2
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No guest, ur wrong for 2 its 1440 

 Jun 17, 2021
edited by IMAGODLYNOOB  Jun 17, 2021

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