Question

Which term of the ap 72,63,54....is fisrt negative term

Answer 1

Step-by-step explanation:

Given AP is: 72, 63, 54,......

Here, first term a= 72,

Common Difference d = 63 - 72 = - 9

$t_n=0$

$\because$ we know that:

$t_n=a + (n-1)d\\</p><p>\implies 0=72+(n-1)(-9)\\</p><p>\implies 0=72-9n+9\\</p><p>\implies 9n =72+9\\</p><p>\implies 9n =81\\</p><p>\implies n =\frac{81}{9}\\</p><p>\implies n=9$

Thus, 9th term of the given AP would be first negative term.