Respuesta :

Step-by-step explanation:

T78 = 5 + (78-1)(3)

= 5 + 77(3)

= 5+231

= 236

>> Answer

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Un = a + (n - 1) × b

U78 = 5 + (78 - 1) × 3

U78 = 5 + 77 × 3

U78 = 5 + 231

U78 = 236