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
- $ \frac{1}{a},\frac{3 - a}{3a},\frac{3 - 2a}{3a} ... (a \ne 0)$
- The first term of an A.P. is 5, the last term is 45 and the sum of all its terms is 400
- How many terms of the Arithmetic Progression 45, 39, 33, ... must be taken so that their sum is 180
- If the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27)
- Find the sum of first 8 multiples of 3
- Which term of the Arithmetic Progression -7, -12, -17, -22, ... will be -82 ?