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! " # # $ % & &" '! ( ) * % + , - %" .%/0. %1 " ,,-," *," *0,0" *," *2.% 0.+ . 0( " 3&) , 45 ,+ 6 , 7 4&8 " % 8 % " %+ " - 8,9-%," 88 8" 8%" 8%8" ,-: 8% % + ;<=>%," 88 8" 8%" 8%8" ,- + + % %%% , 821 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn (n+1) = 2S21)(n n S+=1 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn (n+1) = 2S) % " ? ! @' 1 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn (n+1) = 2S1 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn (n+1) = 2S 1 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn (n+1) = 2S 1 + 2 + 3 + . . . + n-1 + n = Sn + n-1 + n-2 + . . . + 2 + 1 = S(n+1) + (n+1) + (n+1) + . . . + (n+1) + (n+1) = 2Sn
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