Question

The sum of 6 consequtive terms of an Arithmetic progression is 90, what is the sum of first and 6th term​

Answer 1

Step-by-step explanation:

let first of A.P is x

x+(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=90

6x+ 15 =90

6x = 90-15

x = 75/6

x = 12.5

here n=6,d=1,a=12.5

tn=a+(n-1)d

t6=12.5+(6-1)1

t6=12.5+5*1

t6=12.5+5

t6=17.5

now,

the sum of first and 6th term=12.5+17.5=30

plz mark as brainlist