In an A.P., if d = -4, n = 7, an = 4, then a is
6
7
20
28
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We know that
an = a + (n - 1)d∴ 4 = a + (7 - 1) × (-4)⇒ 4 = a + 6 × (-4)⇒ 4 = a - 24⇒ a = 24 + 4⇒ a = 28.
Hence, Option 4 is the correct option.
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If the common difference of the A.P. is 5, then a18 - a13 is
5
25
30
In an A.P., if a18 - a14 = 32 then the common difference is
8
-8
-4
4
In an A.P., if a = 3.5, d = 0, n = 101, then an will be
0
3.5
103.5
104.5
Which term of the A.P. 21, 42, 63, 84, … is 210?
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12th