###
**If 18, a, b – 3 are in A.P. then a + b =**

A. 19
B. 7
C. 11
D. 15
**Answer: Option D**

## Show Answer

Solution(By Apex Team)

18, a, b – 3 are in A.P.,
Then,
a – 18 = -3 – b
⇒ a + b
= -3 + 18 = 15

## Related Questions On Progressions

### How many terms are there in 20, 25, 30 . . . . . . 140?

A. 22B. 25

C. 23

D. 24

### Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.

A. 5B. 6

C. 4

D. 3

### Find the 15th term of the sequence 20, 15, 10 . . .

A. -45B. -55

C. -50

D. 0

### The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

A. 600B. 765

C. 640

D. 680