Question

the first and last term of an Ap are 17and 350 respectively if the common difference is 9 how many term are there and what is their sum?​

Answer 1

Answer:

T1 = a = 17

tn = 350

d = 9

n=?

Sn=?

Tn = a + (n-1) d

350 = 17+(n-1) 9

350-17/9= n-1

37 = n - 1

37 + 1 = n

n = 38

Sn = n/2 (2a + (n-1) d)

Sn = 38/2 (2×17+(38-1)9)

Sn = 19 ( 34 + 333)

Sn = 19 × 11322

Sn= 215118

Mark as brainliest pls

Answer 2

Answer:

Step-by-step explanation

a=17. An =350. D=9

An =a+(n-1)d

350= 17+(n-1)9

333/9 =n-1

n=37+1=38

S38 = 38/2(a+An)

S38 = 19(17+350)

S38 = 19×367

S38 = 6973