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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 thenn 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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