Question

Sum of 10th and 70 th terms of an arithmetic sequence is 806. If its 20 th term is 203 ,find its 60 th term ?​

Answer 1

Answer:

Step-by-step explanation:

a₁₀ + a₇₀ = 806

a + 9 d + a + 69 d = 806

=> 2 a + 78 d = 806

=> a + 39 d = 403    

also given that a₂₀ = 203

=> a + 19 d = 203    

20 d = 200

=> d = 10 a = 13

60th term = a + 59 d

13 + 59×10

=> 13 + 590

=> 603

Answer 2

I hope this will help you