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The second term of a geometric progression is 5 and the fourth term is 31.25. Find the
a)common ratio,r, if r is positive
b)first term
c)sum of the first five terms

Sagot :

Answer:

r = 2.5

Sn = 51.55

Step-by-step explanation:

5r^2 = 31.25

r^2 = 31.25/5

r = sqrt 6.25

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