Question

which of the tarm of A.P.5,2,-1,.....,is -49?

Answer 1

$<b>$


We have;

n=?

Tn=-49

a=5

d=)2-5=-3

d=)-3


We already know that;

Tn=a+(n-1)d

substitute the value of Required terms...

Tn=a+(n-1)d

-49=5+(n-1)-3

-49=5-3n +3

-49=8-3n

-49-8=-3n

-57=-3n

57=3n

n=57/3

n=19


=================
n=19



Thanks!!!