Question

find the sum of aps 2,7,12,......... to 20 terms ​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

2,7,12...... to 10 th term

Here a=2,n=10

And d = 7−2

d = 5

Sn = n/2 [2a+(n−1)d]

Sn = 10/2 [2(2)+(10−1)5]

Sn = 5(4+9×5)

Sn = 245