It was given in an examination that, if the first odd number is 1, the second odd number is 3, the third odd number is 5 and so on. Then what will be the 2000th odd number is
Correct Answer: Option A
These numbers are forming an AP (Arithmetic Progression).
1, 3, 5, …………., (2n - 1)
an = a + (n - 1)(d)
where a = first term d = common difference
a = 1 d = 2
n = 2000th number will be
a2000 = 1 + (2000 – 1)(2) = 2 × 2000 – 1 = 3999
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