Total sum of 2 to 120 even no.
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we used A.P method
2,4,6,,,,,,,,,,120
a=2 an=120 d=2
an=a+(n+1)d
120=2+(n+1)2
(n+1)2=120_2
n+1=118/2
n=59+1=60
sum of even no.=a+an
=n/2(a+an)
=60/2(2+120)
=30×122
=3660
its sum of even no. between 2 to 120
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