Question

if a = 1,2,3,4 find n(A)​

Answer 1

Answer:

10

Step-by-step explanation:

1+2+3+4

3+3+4

6+4

10

Answer 2

Answer:

An=a+n-1d

now substitute the values

4=1+n-11

4-1=n-11

3=n-11

3/1=n-1

3=n-1

n=3+1

n=4