Question
If the first term of a geometric progression (GP) is 12
and the common ratio is 4, then find the sum of its 4 terms.Solution
The sum of n terms of the geometric progression Where? a = first term, r = all ratio Sn=a(rn-1)/n-1 S4= 12(44-1)/ 4-1 = 4 × 255 = 1020
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