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n=x+1
a)
x=3³⁰(3²-1)/3²⁸=3²*(9-1)=9*8=72
n=72+1=73
b)
x=2²¹(2+1)/(3*2¹¹)=20¹⁰*3/3=2¹⁰=1024
n=1024+1=1025
c)
x=5¹²(5²-1)/[5¹²(5+1)=(25-1)/6=24/6=4
n=4+1=5