Math, asked by meghavijay138, 10 months ago

If the 20th term of a h.p is 1 and the 30th term is -117, then its largest term is

Answers

Answered by purankhatri9467
0

Answer:

Given:-A20=1

A30=-117

Step-by-step explanation:

A20=a+19d=-1 -equation1

A30=a+29d=-117 -equation2

subbtracting eqn.1 from eqn.2,

a+19d=-1

a+29d=-117

-. -. +

-10d=116

d=-11.6

Put the value of d in eqn.1,

a+19(-11.6)=-1

a-220.4=-1

a=-1+220.4

a=219.4

d=-11.6

An=a+(n-1)d

=219.4+(n-1)(11.6)

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