Question

Please Help In These 2 Questions
Answer in form of ?1 And ?2 Plz Help

Answer 1

Answer:

I don't know answer please mark me Brainlist

Answer 2

Step-by-step explanation:

n/7*6*5*4|=3/6*5*4|+1/4|

n/7*6*5=3/30+1=33/30

n=7*33=231

b)

1+i/1-i=(1+i)(1-i)/(1-i)(1+i)

=(1+i)^2/1-i^2

=1+i^2+2i/1+1=1-1+2i/2=i

(i)^n=1

n=4