For the sequence 7, 12, 17, 22, …, what is the 20th term?
A97
B102
C105
D112
Answer & Solution
Correct answer: B. 102
This is an arithmetic sequence with first term a = 7 and common difference d = 5. The nth term is tₙ = a + (n−1)d = 7 + (n−1)(5) = 5n + 2. So t₂₀ = 5(20) + 2 = 102.
Related questions
Find the sum: 1 + 3 + 5 + 7 + … + 99 (first 50 odd numbers):In a sequence, t₅ = 17 and t₁₀ = 37. If it is arithmetic, what is the common difference?In the sequence 1, 4, 7, 10, 13, …, what is the SUM of the first 5 terms?What is the SUM of the first 10 natural numbers (1 + 2 + 3 + … + 10)?What is the explicit rule (formula) for the nth term of the sequence 4, 7, 10, 13, …?Which of the following is a sequence with COMMON DIFFERENCE 4?If the explicit rule for a sequence is uₙ = 3n + 2, find u₁₀:The 6th triangular number is: