Q. If f(1)=2 and f(n+1)=f(n)2−1 then find the value of f(4).Answer:
Given conditions: We are given the initial condition and the recursive formula:f(1)=2f(n+1)=f(n)2−1We need to find f(4). To do this, we will calculate f(2), f(3), and then f(4) using the recursive formula.
Find f(2): First, we find f(2) using the given formula with n=1: f(2)=f(1)2−1 Substitute f(1)=2 into the formula: f(2)=(2)2−1 f(2)=4−1 f(2)=3
Find f(3): Next, we find f(3) using the given formula with n=2: f(3)=f(2)2−1 Substitute f(2)=3 into the formula: f(3)=(3)2−1 f(3)=9−1 f(3)=8
Find f(4): Finally, we find f(4) using the given formula with n=3:f(4)=f(3)2−1Substitute f(3)=8 into the formula:f(4)=(8)2−1f(4)=64−1f(4)=63
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