Question

The first term ot an A.P is
5, the last term is 45 and
sun is 400. Find the number
of terms and common
difference.​

Answer 1

Step-by-step explanation:

Tn=a+(n-1)d

45=5+(n-1)5

45=5+5n-5

45=5-5+5n

45=0+5n

45divide5=n

9=n