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