Question

For an A.P., if t7

= 4, d= -4 then a = _______ .

a) 6 b) 7 c) 20 d) 28​

Answer 1

Answer:

a=28

Step-by-step explanation:

T7=4

Tn=a+(n-1)d

T7=a+(7-1)*-4

4=a+6*-4

4=a-24

so

a=24+4=28