Question

if the sum of first term of an Ap is 3n²/2 +5n/2.Find the 25th term
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Answer 1

Answer:

➡ Sn = 3n?/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 + 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.

Step-by-step explanation:

HOPE IT HELP YOU

Answer 2

plz refer to this attachment