12 + 22 + 32 +.......+ 102 + 112 + 122 = 650 ആണെങ്കിൽ, 5 + 20 + 45 + .....+ 500 + 605 + 720 ഇതിനോട് തുല്യമാണ്:

1
2750
2
2500
3
3250
4
5000

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