find the sum of 1st 25 term.who n term is an (7-3)n
pls do step by step guys
Answers
Answered by
1
Answer:
Step-by-step explanation:
sn=? n =25
n(7-3)
n(7-3)
7n-3n=4n
4(25)=100
therefore sum of 1st 25 terms is 100
Answered by
0
Answer:
First term (n=1) = 7 - 3 (1) = 4. Last term (n=25) = 7 - 3(25) = -68. -800.
Missing: pls guys
Top answer · 3 votes
if you know Tn of any series you can calculate it’s sum for any number of terms. sum(Sn)= ... More
7 votes
We have, Tn = 7 - 3n Putting n = 1 Then, T1 = 7 - 3 × 1 = 4 Now , putting n = 2 Then, ... More
4 votes
Solution: Nth term = 7–3n Let n=1 , therefore 1st term = 7–3×1 =4 Similarly, putting ... More
5 votes
Tn = 7 -3n Sn= 7.sigma 1 - 3.sigma n. Sn= 7 n - 3.n.(n+1)/2 Putting n=25 S25 = 7.25–3.25.26/2. ... More
5 votes
TN = 7 - 3n n = 25 First term (n = 1) = 7 - 3(1) = 4 Last term (n = 25) = 7 - ... More
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