Question

There are 100 different books on a shelf number of ways in which 3 books can be selected

Answer 1

100÷3 =33 in33 ways 3 books can be selected

Answer 2

The total number of ways for required condition $={ C }_{ 3 }^{ 100 }-98.$.

Step-by-step explanation:

Given,

Total books = 100

To find, the number of ways in which 3 books can be selected = ?

∴ Number of ways to select = $^{100}C_3$

Number of three consecutive points = 98

∴ The total number of ways for required condition$={ C }_{ 3 }^{ 100 }-98$

Hence,  the total number of ways for required condition$={ C }_{ 3 }^{ 100 }-98$.