Question

write in multiplicative inverse
$- 1 + \sqrt{3i}$
​

Answer 1

Answer:Let z=  

5

​

+3i

Then,  

z

ˉ

=  

5

​

−3i and ∣z∣  

2

=(  

5

​

)  

2

+3  

2

=5+9=14

Therefore, the multiplicative inverse of  

5

​

+3i is given by

z  

−1

=  

∣z∣  

2

 

z

ˉ

 

​

=  

14

5

​

−3i

​

=  

14

5

​

 

​

−  

14

3i

​

Step-by-step explanation:

Answer 2

Answer:

here is your 1st answer

n

C

7

=

n

C

5

7!×(n−7)!

n!

=

5!×(n−5)!

n!

7×6

1

=

(n−5)(n−6)

1

comparing LHS and RHS we get, n=12