find the number of the terms in an AP,18,15,12 ....... -48 and also find the sum of all of its terms
Answers
Answered by
3
Answer:
hi
Step-by-step explanation:
ANSWER
Given,
a=18
d=
2
31
−18=−
2
5
Formula,
a
n
=a+(n−1)d
=18+(n−1)(−
2
5
)
a
n
=
2
41−5n
S
n
=
2
n
[2a+(n−1)d]
=
2
n
[2(18)+(n−1)(−
2
5
)]
=
2
n
[
2
41−5n
]
S
n
=
4
41n−5n
2
Answered by
14
Answer:
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