1*2+3*2+5*2+......+25*2=?
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Answer=338
Step-by-step explanation:
1*2+3*2+5*2+.......+25*
1*2=2
3*2=6
5*2=10
7*2=14
9*2=18
11*2=22
13*2=26
15*2=30
17*2=34
19*2=38
21*2=42
23*2=46
25*2=50
=2+6+10+14+18+22+26+30 +34+38+42+46+50=338
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