Question

the first and the last term of an ap is 17 and 15 respectively if the common difference is 9 how many terms are there and what is there some

Answer 1

Step-by-step explanation:

first term (a) = 17

last term (an) = 15

common difference (d) = 9

number of terms (n) = ?

using

an = a + (n - 1)d

15 = 17 + (n - 1)9

15 = 17 + 9n - 9

15 = 8 + 9n

7 = 9n

n = 7/9

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