Math, asked by ammutty42, 4 months ago

Consider the arithmetic sequence 13,23,33....
a. What is the algebraic expression for this sequence?
b. Find the 100th term of the sequence?
c. Find the sum of first 20 terms of this sequence.
pls answer the question correctly....I will Mark you as brainlist.​

Answers

Answered by ananyapatil0706
1
a) Tn=13+(n-1)10

b)T100=13+(99*10)=203

c)S20=(20/2)*[2(13)+19(10)]=2160
Answered by shawritika1996
1

Answer:

b. Here,

a= 13 , d = 10 ( difference between the second and first term)

so, by formula

100th term = a + 99d

= 13 + 99 × 10

= 13 + 990

= 1003

c. First, we need to find the 20th term

20th term = a + 19d

= 13 + 19 × 10

= 13 + 190

= 203

The sum first 20 terms = a + 20th term

= 13 + 203

= 216

sorry, I can't solve a.

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