Question

find first negative term an AP series55, 50,45,40....?

Answer 1

Answer:

here a=55 & d= –5

if a of n = 0

a of n = a + d(n–1)

0 =55-5n+5

–60=–5n

n=+12

so 12 th term of this a.p is 0

so first negative term is 13th term whis is equal to

a of 13= 55–5(12)

a of 13= 55-60

a of 13= –5

so first negative term is 13th term ,whose value is -5