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Cat face 1+3+5+...+35?

Răspuns :

1 +3 +5 +....+35 
n = ( 35 - 1 ) : ( 3 - 1 ) 
n = (34 : 2) +1
n = 17 +1
n = 18

S = [( 35 +1) x 18 } : 2
S = ( 36 x 18 ) : 2
S = 648 : 2
S = 324.