Sum of first n terms of a series is 5n2 + 2n, and then its second term is--
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Use the Arithmetic progression formula
Tn = a ( n - 1 ) d
or
Sn = n / a * { 2a + ( n - 1 ) d }
Tn = a ( n - 1 ) d
or
Sn = n / a * { 2a + ( n - 1 ) d }
Answered by
10
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