Question

For given AP t=4, d=-4 then find a value ​

Answer 1

Answer:

a = 28

Explanation -

Given

d = -4

t7 = 4

a = ?

Solution -

nth term in AP is given by -

tn = a + (n-1)d

Now putting, t7=4, n=7 & d=-4

t7 = a + (7-1)(-4)

4 = a - 24

a = 4 + 24

a = 28

Therefore, value of first term must be 28.