Question

for a given A.P t7=13,d=-2,than a=?​

Answer 1

Answer:

18

Step-by-step explanation:

t7 = a+6d -->(1)

t13 = a+12d -->(2)

Given that (1) = (2)

a+6d = a+12d

Given that d =-2

a-12 = a-24

2a= 36

a=18