If 16th term of a GP is 9375 and its 4th term is 375 .find its 9th term?
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a + 15d = 9375. ........1
a + 3 d = 375. .........2
solving equations 1 and 2,
we get : a = -1875
d = 750
a9 = a + (n -1)d
a9 = -1875 + (9-1)750
a9 = -1875 + 8×750
a9 = 4125.
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