Find the sum of the following APs:
–37, –33, –29, . . ., to 12 terms.
Here, a = –31
d = –33 – (–37)
= – 33 + 37 = 4
n = 12
We know that,
= 6 [-74 + 11 x 4]
= 6 x [-74 + 44]
= 6 x (-30) = -180
Hence, the sum of First 12 terms of the given
A.P. = –180
Find the sum of the following APs:
–37, –33, –29, . . ., to 12 terms.
Here, a = –31
d = –33 – (–37)
= – 33 + 37 = 4
n = 12
We know that,
= 6 [-74 + 11 x 4]
= 6 x [-74 + 44]
= 6 x (-30) = -180
Hence, the sum of First 12 terms of the given
A.P. = –180
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