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प्रश्न
In an AP, if d = –4, n = 7, an = 4, then a is ______.
पर्याय
6
7
20
28
उत्तर
In an AP, if d = –4, n = 7, an = 4, then a is 28.
Explanation:
We know that nth term of an AP is
an = a + (n – 1)d
Where,
a = first term
an is nth term
d is the common difference
According to the question,
4 = a + (7 – 1)(– 4)
4 = a – 24
a = 24 + 4 = 28
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संबंधित प्रश्न
Choose the correct choice in the following and justify:
30th term of the AP: 10, 7, 4, ..., is ______.
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Which term of the A.P. 84, 80, 76, ... is 248?
Find the 12th term from the end of the following arithmetic progressions:
1, 4, 7, 10, ..., 88
20th term of the AP -5, -3, -1, 1, is ______.
The number of multiples lie between n and n2 which are divisible by n is ______.
The next term of the AP `sqrt18, sqrt50, sqrt98, ....` is ______.
For the AP: –3, –7, –11, ..., can we find directly a30 – a20 without actually finding a30 and a20? Give reasons for your answer.
Write the first three terms of the APs when a and d are as given below:
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What is the common difference of an AP in which a18 – a14 = 32?
