Question

hi
In an A.P., the sum of first n terms is 3n²/2+5n/2. find an and 25 th term
please solve it
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Answer 1

Answer:

Hey hi !!

Sn = 3n²/2 + 5n/2

We know that ,

nth term = (sum of nth term) - (sum of (n-1)th term)

So , according to the question ,

25th term = (sum of 25th term) - (sum of (25-1)th term)

= (sum of 25th term) - (sum of 24th term)

= [3(25)²/2 + 5(25)/2] - [3(24)²/2 + 5(24)/2]

= [1875/2 + 125/2] - [1728/2 + 120/2]

= (2000/2) - (864 + 60)

= 1000 - 924

= 76

So , the 25th term of the AP is 76.

Hope it helps !  ツ

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Answer 2

Answer:

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