Question

If the 6th term of an ap is -10 and its 10th term is minus 26 then find the 15th term of an ap

Answer 1

Step-by-step explanation:

t6=-10

a+(6-1)d=-10

a+5d=-10. --- 1

d=(t(m)-t(n))/m-n

=(-26+10)/10-6

=-16/4

=-4

d=-4

by 1

a+5d= -10

a+5(-4)=-10

a=-10+20

a=10

Thus

a+(n-1)=t(n)

t(15)=10+(15-1)(-4)

=10-(14)*4

=10-56

=-46