4th term of gp is 40 and 10th term is 2560.find 7th term
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4th term = a r^3 = 40_______(1)
10th term = a r^9 = 2560_____(2)
dividing equation 2 by 1,
r^6 =64
⇒r = 2
so, a = 40/8 = 5
7th term = a r^6 = 5×64 = 320
10th term = a r^9 = 2560_____(2)
dividing equation 2 by 1,
r^6 =64
⇒r = 2
so, a = 40/8 = 5
7th term = a r^6 = 5×64 = 320
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the 7th term is 320
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