primero debes hacer esto
tu=t1 + (n-1)r
342=75 + 3n - 3
342 - 72=3n
270=3n
n=90
luego:
(t1 +tu)n/2
(75 + 342)90/2
417 * 45
18765
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primero debes hacer esto
tu=t1 + (n-1)r
342=75 + 3n - 3
342 - 72=3n
270=3n
n=90
luego:
(t1 +tu)n/2
(75 + 342)90/2
417 * 45
18765