Question

In an AP, if S3 = 18 and d = 3 , then first term is ...​

Answer 1

Answer:

s3 = a+a+d+2a+d

= 4a+2d

18 = 4a+ 2*3. (s3=18, d=3)

18 = 4a+ 6

18-6 = 4a

12= 4a

a= 3

therefore, first term of an AP is 3

Step-by-step explanation:

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