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U2 = ar
7 = ar
U4 = ar^4-1
U4 = ar^3
252 = ar^3
a) cari rasio
U4/U2
ar^3/ar = 252/7
r² = 36
r=√36
r = 6
b) maka cari suku awal dulu
U2 = ar
7 = a x 6
a = 7/6
maka
U5 = ar^5-1
U5 = 7/6 x 6^4
U5 = 7/6 x 1296
U5 = 1512