Which term of the AP : 3, 8, 13, 18, . . . ,is 78?
The given A. P. is 3, 8, 13, 18, .....
Here, a = 3
d = 8 - 3 = 5
Let the nth term f=of the A. P. be 78
Then, an = a + (n - 1)d
78 = 3 + (n -1) (5)
5(n - 1) = 78 - 3
5 (n - 1) = 75
n - 1 = 15
n = 15 + 1
n = 16
Hence, 16th term of the A .P. is 78.
Write first four terms of the AP, when the first term a and the common difference d are given as follows:
a = –2, d = 0
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, . . .
Mock Test Series
