Question

What is the first term in the sequence for which d = -2 and a7 = 3?

Answer 1

Answer:

First term is 15

Step-by-step explanation:

Given data:

$a_{7} =3\\d=-2$

Now,

$a+6d=3.....(1)\\a_{n} =a+(n-1)d\\\\\\From equation (1)\\a+6(-2)=3\\a-12=3\\a=12+3\\a=15$

Therefore first term a =15

Correct option is (c)