which is the 5th term of the A.P 21, 18, 15....?
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Answer:
a = 21
d = 18 - 21
= -3
Now,
tn = a + ( n - 1 )d
=> t5 = 21 + ( 5 - 1 ) -3
=> t5 = 21 + 1
=> t5 = 22
Hence, 5 th term of the A.P is 22.
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