2+4+6+.........+30 =?
aditibha:
ans is 240
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a=2
l=30
Sn=n/2(a+l).
S30=30/2(2+30)
=15*32=480
l=30
Sn=n/2(a+l).
S30=30/2(2+30)
=15*32=480
this is right answer
no, it is 280
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