CBSE BOARD X, asked by vishalragav2554, 10 hours ago

The first and the last terms of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?

Answers

Answered by muskangoel01

2

Answer:

an=a+(n-1)d

350=17+(n-1)9

350=17+9n-9

342=9n

Number of terms=342/9

n=38

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

S38=19(34+37×9)

S38=19×367

6973 is the answer

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