Question

The first and last terms of an A.P. ae 5 and 45
respectively. How many terms with common
difference 4, are there in the A.P​

Answer 1

Answer:

so, there are 11 terms in the AP

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Answer 2

Answer:

Step-by-step explanation:

a=5.

a(n) = 45

d = 4

a(n) = a + (n-1)d

45 = 5 +(n-1)4

45 = 5 + 4n -4

4n +1 = 45

4n = 45 - 1

4n = 44

n = 44//4

n = 11

No of terms = 11