Q20 of 178 Page 548

If 4/5, a, 2 are in AP, find the value of a.

Since, the terms are in an AP, therefore

a - (4/5) = 2 - a


⇒ 2a = 2 + (4/5)


⇒ 2a = 14/5


⇒ a = 14/10


⇒ a = 7/5


∴ a = 7/5


More from this chapter

All 178 →
18

Find the sum of first n even natural numbers.

 19

The first term of an AP is p and its common difference is q. Find its 10th term.

 21

If (2p + 1), 13, (5p – 3) are in AP, find the value of p.

 22

If (2p – 1), 7, 3p are in AP, find the value of p.