Question

Of first and last term of an AP is 17 and 350.if common difference is 9,how many term in their AP and what is their term?

Answer 1

AP nth term = a+(n-1)d

Where
a= first term
d= common difference
n = number of terms

Therefore:-

350 = 17 + (n-1) 9

9n = 342

n = 38

Sum of AP =( n/1)[2a+(n-1)d]

= (38/2)[ 2*17+ 37*9]

= 19 [34 +333] = 6973

Answer 2

there are 38 terms in an AP