Question

r
4. If the 10th term of an AP is
0 ,then find the ratio of the
27th term and the 15th term
the AP.​

Answer 1

Step-by-step explanation:

Step-by-step explanation:

a = first term of an AP

As we know,

In an AP for any nth term,

Tn = a + ( n - 1 ) d

∴ 9th term = a + (n-1)d

= a + (9-1)d

= a + 8d

From above, a = -8d

∵ 29th term = a + 28d

19th term = a + 18d

On putting the value of a,

29th term = (-8d )+ 28d

= 20d

19th term = a + 18d

=(-8d) + 18d

= 10d

hence, The ratio of 29th term and 19th terms is

⇒\frac{20d}{10d}

10d

20d

⇒\frac{2}{1}

1

2

⇒ 2: 1