Question

4. Find whether 55 is a term of the AP 7, 10, 13​

Answer 1

Answer:

yes , 55 is the 17 th term of given AP .

Step-by-step explanation:

$a + (n - 1)d = 55 \\ 7 + (n - 1) \times 3 = 55 \\ (n - 1) \times 3 = 55 - 7 \\ (n - 1) \times 3 = 48 \\ (n - 1) = 48 \div 3 \\ n - 1 = 16 \\ n = 16 + 1 \\ n = 17$