1.

2+3++4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30=?​

Answer»

ANSWER:

 434    

Step-by-step explanation:

2+3+4+5+6+7+8+9+10=54

11+12+13+14+15+16+17+18+19+20=155

21+22+23+24+25+26+27+28+29+30=225

54+155+255=434



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