find the 21st term of an AP = - 9/2,-3,-3/2
Answers
Answered by
4
The 21st term is 51/2
Solution:
Given that,
The arithmetic sequence is:
Find the common difference between a term and its previous term
The nth term in an AP is given as:
Where,
n is the nth term
d is the common difference
is the first term
Find the 21st term:
Substitute
Therefore,
Thus 21st term is found
Learn more about AP
Sum of three consecutive terms of an Arithmetic Progression is 42 and their product is 2520. Find the terms of the Arithmetic Progression.
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Which term of the Arithmetic Progression - 7,-12,-17,-22 will be -82 ? Is -100 any term of the A.P. ? Give reason for your answer.
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Answered by
0
Answer:
a= -9/2
d=3/2
n=21
d= b-a
b=-3-(-9/2)
=3/2
an =a+(n-1)d
put the givens in this equation
will be
an= -9/2+(21-1)3/2
an=-9/2+(20)3/2
an= -9/2+60/2
an= 51/2
step
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