The 5th term of an ap is 38.And the nineth term is 66. Find its 25th term
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Answer:
178
Step-by-step explanation:
an = a + (n -1)d
a5
38 = a + 4d. (1)
a 9
66 = a + 8d (2)
from eq 1 - 2
d = 7
and a = 10
therefore
a25 = 10 + (25 -1) 7
a 25 = 178
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