Question

if in ap the common difference is d and 7th term is 1 then find 1st term

Answer 1

Common difference=d and first term be a
Now,
a+6d=1
Therefore first term..
A=1-6d
#hope helps

Answer 2

Answer:

$1-6d=a$

Step-by-step explanation:

We are given that $a_7 = 1$ and Common difference is d

We are required to find first term.

Now,

Formula of nth term : $a_n=a+(n-1)d$

Where n is the term number.

a = first term.

d = common difference .

So,,$a_7=a+(7-1)d$

Now, since we are given that $a_7 = 1$

$\Rightarrow 1=a+6d$

$\Rightarrow 1-6d=a$

Hence the first term of A.P. is $1-6d=a$