Question

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

Answer 1

Answer:

there are 38 terms

sum is 6973

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Answer 2

Answer:

Step-by-step explanation:

a1=17 and an=350 ...D= 9 now

we have to find n

according to formula

an=a+(n-1)d

= 350=17+(n-1)9

  350=17+9n-9  

  350=8+9n

  350-8=9n

  342/9=n

  38=n

now thier sum will be

sn=38/2(17+350)

sn=19×367

Sn=6973