Question

An arithmetic sequence has a common difference of 3 and the fifth term of the sequence is seven times the first term of the sequence.List the first seven terms of this sequence.

Answer 1

a5=7a1
a+4d= 7 (a)
4d=6a
12=6a
a =2

the 7 terms are ... 2,5,8,13,18,23,28..

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Answer 2

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Common difference (d) = 3

a5 = 7a1
a1 + 4d = 7a1
4d = 6a1
4(3) =6a1
12 = 6a1
a1 = 2

So, First term is 2

Seven terms of the sequence is 2 , 5,8 , 11,14,17,20...
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