Find the sum of 25th term of AP in which nth term is given by (7-3n).
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Tn =7-3n
T1=7-3=4
T25=7-75=-68
Sum =25/2 (4+(-68))
25/2×-64
25×(-32)
=-800
answer
T1=7-3=4
T25=7-75=-68
Sum =25/2 (4+(-68))
25/2×-64
25×(-32)
=-800
answer
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