Page 102 Chapter two exercise:
Key point to prove that "if S(k) is true then S(k+1) is true." :
Sum of the 1st term to the (k+1)th term =
Sum of the 1st term to the kth term + the (k+1)th term.
Replace the answer of Sum of the 1st term to the kth
term to the last step and simplify it.
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