Question

how will find the first term of a Arithmetic sequence ​

Answer 1

Answer:

Given an arithmetic sequence with the first term a1 and the common difference d , the nth (or general) term is given by an=a1+(n−1)d .

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Answer 2

Answer:

a = tn - d(n-1)

Step-by-step explanation:

We can find it from the formula,

tn = a + (n-1)d

where tn = last term

a = first term

n = no. of terms

d = common difference

so, by rearranging we get,

tn = a + nd - d

tn - nd - d = a

tn - d (n-1) = a

so, a = tn - d (n-1)

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