Question

the first and last term of an ap are -7 and 233 and the sum of ap is 9153 find n ?​

Answer 1

Answer:

9153=(n/2)*[-7+233]

9153*2=226n

n=18036/224

n=81

Answer 2

Answer:

The answer is 81

Step-by-step explanation:

Given data:

The first term of AP, $a$ = -7

The last term of AP, $l$ = 233

Sum of terms in AP, S$n$= 9153

Here we need to find number of terms 'n'

sum of n terms in AP = Sn =  $\frac{n(a+l)}{2}$  

here $a$ = first term, $l$ = last term and $n$ = number of terms

from given data    $\frac{n(a+l)}{2} = 9153$  

                         $\frac{n(-7+233)}{2} = 9153$

                            n (226) = 18306

                                      n = 18306/226

                                      n = 81