In an AP, if the common difference (d) = –4, and the seventh term (a7) is 4, then find the first term.
a7 = 4
a + 6d = 4
as an = a + (n-1) d
but d = -4
a + (-24) = 4
a = 4 + 24 = 28
therefore first term a = 28
Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a = 4, d = – 3
Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a = – 1.25, d = – 0.25
For the following APs, write the first term and the common difference
3, 1, – 1, – 3, . . .
For the following APs, write the first term and the common difference
– 5, – 1, 3, 7, . . .
For the following APs, write the first term and the common difference
0.6, 1.7, 2.8, 3.9, . . .
Which of the following are APs ? If they form an AP, find the common difference d and write three more terms.
– 1.2, – 3.2, – 5.2, – 7.2, . . .
Mock Test Series
