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If 2^n−1+2^n+1=320 then n is equal to:
Question 1:
If 2^n−1+2^n+1=320 then
n is equal to:
A.
6
B.
8
C.
5
D.
7
Feedback
2^n−1+2^n+1=320 ⇔2^n−1(1+2^2)=320 ⇔5×2^n−1=320 ⇔2^n−1=320/5 =64=2^6 ⇔n−1=6 ⇔n=7
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