What is the common difference of an A.P
Arithmetic Progressions (10)What is the common difference of an A.P. in which a21 - a7 = 84 ?
Answer
a21 - a7 = 84
(a + 20d) - (a + 6d) = 84
14d = 84
d = 6
Exam Year:
2017
Related Questions
- Find the sum of first 25 terms of the A.P.
- In an AP, if the common difference (d) = -4, and the seventh term
- In an A.P, if $ S_{n} = 3n^2 + 5n $ and $ a_k = 164 $
- Which term of the progression $20, 19 \frac{1}{4},18\frac{1}{2} ,17\frac{3}{4}$... is the first negative term
- If the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27)
- How many terms of the Arithmetic Progression 45, 39, 33, ... must be taken so that their sum is 180