Question

please solve it fast ....

Answer 1

hope it is right...... sorry it is wrong answer

Answer 2

heya
it's too easy ☺

If this is in Ap.

k+9, 2k-1and 2k+7

then as you know that the Common difference between two cinsecutive term of an AP is same.

so, common difference D"=t2-t1 【where t2 is 2nd term and t1 is first term of an AP】

so,D=(2k-1)-(k+9)
"D"=k-10-------1)

and another D=t3-t2 【t3 is third term and t2 is 2nd term】

D"=2k+7-(2k-1)

D=8-------2)>>

<<from 1 )and 2)

we get..

8=k-10

k=18.....ANS

hope it help you .☺

@rajukumar☺