Question

In an AP if the common difference (d)=-30 and the seventh term (a7) is 4 then find the first term.​

Answer 1

Answer:

184

Step-by-step explanation:

Data Given-

d = -30

a7 = 4

We know that nth term of AP is

=> an = a + (n - 1)d

=> a7 = a + (7 - 1)d [n=7]

=> 4 = a + 6(d)

=> 4 = a + 6(-30)

=> 4 = a + (-180)

=> 4 = a - 180

=> a = 4 + 180

=> a = 184

Hence-

First term of AP is 184.