Home
Class 10
MATHS
Which term of the AP : 3, 8, 13, 18, . ....

Which term of the AP : 3, 8, 13, 18, . . . , is 78?

Text Solution

Verified by Experts

Here, a=3,
`a=8-3=13-8=5`
Let `a_(n)=78`
`rArr 3+(n-1)5=78`
`rArr 3+5n-5=78`
`rArr 5n-2=78`
`rArr 5n=80 rArr n=16`
`:.` 16th term of the given A.P. is 78.
Promotional Banner

Topper's Solved these Questions

  • ARITHMETIC PROGRESSION

    NAGEEN PRAKASHAN|Exercise Problem From NCERT/exemplar|20 Videos

  • ARITHMETIC PROGRESSION

    NAGEEN PRAKASHAN|Exercise Exercise 5a|5 Videos

  • AREA RELATED TO CIRCLES

    NAGEEN PRAKASHAN|Exercise Revision Exercise Long Answer Question|6 Videos

  • CIRCLES

    NAGEEN PRAKASHAN|Exercise Revision Exercise Long Answer Questions|3 Videos

Similar Questions

Explore conceptually related problems

Which term of the AP 3, 8, 13, 18, …. is 88?

Which term of the AP:- 21, 18, 15, . . . is – 78?

Which term of the A.P: 3,8,13,18 …… is 78 ?

Which term of the AP 5, 9, 13, 17, … is 81?

Which term of the A.P. 3,8,13 …is 78?

Which term of the A.P.3,8,13 is 248?

Which term of the series 3, 8, 13, 18, 23 ... is 603 ?

Which term of the AP: 21,18,15, is 0?

Which term of the A.P.3,8,13,18,.....is 78 ?