Question

in an AP the sum first nth term is given by Sn = 3n2/2 5n/2.find the 25th term
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Answer 1

Answer:

Let the sum of n terms be given by Sn so. Sn = 3n²/2+ 5n/2. S1 = 3(1)²/2 + 5(1)/2 = 3/2+5/2 => 4 so 1st term is 4 say 'a'

Answer 2

Answer:

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