Question

t19 = ? for the given A.P., 9,4,-1,-6...​

Answer 1

Answer:

here a=9

d=-5 ,n=19

t19= a+(n-1)d

= 9+(19-1)-5

= 9+18(-5)

=9+ (-90)

=-81

t19=-81

Answer 2

a=9,d=-5

tn=a+(n-1)d

t19=9+(19-1)(-5)

=9+(18)(-5)

=9+(-90)

t19 =-91