Question

Helpp! in attachment

Answer 1

here it is

Answer 2

Is it 2343?

Answer 3

That's correct!

Answer 4

yes i agree!
\[3 \cdot \frac{1-5^5}{1-5}=2343\]

Answer 5

Thank you very very much :)

Answer 6

3*5^0+3*5^1+3*5^2+3*5^3+3*5^4
3(5^0+5^1...+5^4)
1+a+a^2+a^n
sum=(a^n-1)(a-1)
here we have
3*(5^5-1)/(5-1)
2343