Questions 1-4 : Find the nth term of the following arithmetic sequences :
125, 120, 115, 110, …………
The 10 th and 18 th terms of an arithmetic sequence are 41 and 73 respectively. Find the n th term.
Find n so that the n th terms of the following two arithmetic sequences are equal.
The sum of n terms of an arithmetic sequence is 5n 2 + 2n. Find its n th term.
n th term of an arithmetic sequence :
Substitute a1 = 4 and d = 5.
125, 120, 115, 110, …………
n th term of an arithmetic sequence :
Substitute a1 = 125 and d = -5.
n th term of an arithmetic sequence :
Substitute a1 = 24 and d = -3/4.
n th term of an arithmetic sequence :
Substitute a1 = √2 and d = 2 √2 .
Substitute d = 4 in (1).
n th term of an arithmetic sequence :
Substitute a1 = 5 and d = 4 .
n th term of an arithmetic sequence :
Substitute a1 = 1 and d = 6 .
n th term of an arithmetic sequence :
Substitute a1 = 100 and d = -5 .
Given : n th terms of the two arithmetic sequences are the same.
Given : The sum of n terms is 5 n 2 + 2n.
Substitute n = 1.
Substitute n = 1.
So, the first term of the given arithmetic sequence is 8.
Sum of first two terms is 24.
First term + Second term = 24
n th term of an arithmetic sequence :
Substitute a1 = 7 and d = 10.
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