CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

20 A.Ms are inserted between 2 and 86. Find the 19th A.M.


  1. 78

  2. 84

  3. 82

  4. 80


Solution

The correct option is A

78


When we add 20 A.Ms between 2 and 86, the resultant A.P would look like
2,A1,A2,........A19,A20,86

There are 22 numbers in this A.P including 2 and 86.
First term of this A.P is 2 and the last term is 86. A1 is the second term and 86 is the 22nd term.
t1=2
t22=86
To find the common difference,
2+(221)d=86
d=4
A19 is the 20th term of the A.P.
A19=t20
t20=2+(201)4
=2+19×4
=78

flag
 Suggest corrections
thumbs-up
 
0 Upvotes


Similar questions
View More


People also searched for
View More



footer-image