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a = -4 r = -3
by the general formula ,a+(n-1)*d * * * * * That assumes that it is an arithmetic sequence. The sequence cound by geometric ( t(n) = a*rn ) or power ( t(n) = n2 ) or something else.
The ratio can be found by dividing any (except the first) number by the one before it.
To find the common ration in a geometric sequence, divide one term by its preceding term: r = -18 ÷ 6 = -3 r = 54 ÷ -18 = -3 r = -162 ÷ 54 = -3
U2/U1 = 4 So Un = 3*4n-1 and therefore, U75 = 3*474 = 1.0704*1045 approx.