Question

I) For an given A.P. t7

= 4, d = -4 then a = . . .​

Answer 1

a = 28

Explanation:

Given : t7= 4 , d = -4

Solution : tn = a + (n - 1) d ......( formula)

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

4 = a + (6)( - 4)

4 = a - 24

4 + 24 = a

28 = a

therefore, the first term (a) is 28.