Question

The first term of AP is 5 and the last term is 45 and the common difference is 10. Find the number of terms. ​

Answer 1

Answer:

5

Step-by-step explanation:

a=5

an=45

d=10

n=?

Formula => an=a+(n-1)d

45=5+(n-1)10

45-5=(n-1)10

40=10n-10

50=10n

n=50/10

n=5

Answer 2

Answer:

a=5 , last term = 45 , d= 10

n= ?

last term =45

a+(n-1)d=45

5 +(n-1)10=45

5+10n-10=45

10n-5=45

10n=45+5

10n=50

n=50/10

n=5