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02.7.12.....10 पदों तक
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n= 10
a = 2
Sn=?
Solve:d = 7-2=5
Sn=n/2{2a+(n-1)d}
=10/2{2×2+9×5}
=5{4+45}
=5×49
=245.
Therefore, the sum is 245.
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