Question

Find n, if 3 = 13 ( + 1)3​

Answer 1

Answer:

tn = a + ( n -1 ) × d (formula)

it should be 4= instead of 3=

Step-by-step explanation:

• 4= 13 + (n - 1) × 3
• 4 - 13 = n - 1 × 3
• - 9 = n-1 × 3
• -9 ÷ 3 = n - 1
• -3 = n - 1
• n = 9 - 1
• therefore n = 8