Question

Find the 10 th term of series 9, 6, 4.. .

Answer 1

a = 9

d = -3

T10 = a + 9d

= 9 - 27

= - 18

Answer 2

It's easy.

first write given series that is 9,6,4......

We know first term(a)=9 , common difference(d)=t2-t1=6-9=-3.

From this we can find the 10th term

We know A.P=a+(n-1)d

t10=9+(10-1)-3 (we know n=10,a=9,d=-3)

t10=9+9×-3

t10=9-27

t10=-18

So answer is t10=-18

Thankyou