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1. diket :
a = 4
b = 5
Un = a + (n-1)b
= 4 + (n-1)5
= 4 + 5n - 5
Un = 5n - 1
2. diket :
a = 1
r = 2/1 = 2
Un = ar^n-1
= (1)(2)^n-1
Un = 2^n-1
*catatan
tanda ^ untuk pangkat ya...
semoga bermanfaat
a=4, b=5
Un=a+(n-1)b
=4+(n-1)5
=4+5n-5
=4-5+5n
=-1+5n
=5n-1 (c.)
2. rumus suku ke n
a=1, r=2
Un=ar^n-1
=1×2^n-1
=2^n-1 (b.)