The first and the last term of ap are 8and 350 respectively if its common difference is 9 how many term qre there and what is sum
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S39=6981
S39=6981
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Given :
- First term, a = 8
- Last term, l = 350
- Common difference, d = 9
To Find :
- Number of terms in AP, n = ?
- Sum of total number of terms in AP,
Solution :
Let, l be the nth term of AP.
Now, we know that :
By, putting values,
Hence, There are 38 number of terms in given AP.
Now, let's find sum of total number of terms in AP.
We know that :
We have :
- n = 39
- a = 8
Hence, There are 39 number of terms in given AP and their sum is 6981.
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