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2014-10-09T11:06:45+03:00
A)3(1+2+3+4...667)=3(667x668/2)=3(445556/2)=3x222778=668334
b)4(1+2+3+4...500)=4(500x501/2)=3x(250500/2)=3x125250=375750
c)5(1+2+3...400)=5x(400x401/2)=3x80200=240600
d)7(1+2+3...286)=7(286x287/2)=7x41041=287287
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