If P(n) is the statement “2n ≥ 3n”, and if P(r) is true, prove that P(r + 1) is true.

Given. P(n) = “2n ≥ 3n” and p(r) is true.


Prove. P(r + 1) is true

we have P(n) = 2n ≥ 3n


Since, P(r) is true So,


= 2r 3r


Now, Multiply both side by 2


= 2.2r 3r.2


= 2r + 1 6r


= 2r + 1 3r + 3r [since 3r>3 = 3r + 3r3 + 3r]


Therefore 2r + 1 3(r + 1)


Hence, P(r + 1) is true.


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