Odp:
a_1 = 2
r = 5
a_n = a_1 + (n-1)r = 2 +(n-1)5 = 5n - 3
EDIT:
Link : http://img29.imageshack.us/img29/2384/blalbal001.jpg
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EDIT:
Link : http://img29.imageshack.us/img29/2384/blalbal001.jpg