Mathematics
If the numbers n - 2, 4n - 1 and 5n + 2 are in A.P., find the value of n.
AP GP
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Answer
Here, a = a1 = n - 2, a2 = 4n - 1 and a3 = 5n + 2
Since, the numbers are in A.P. so,
a2 - a1 = d = a3 - a2
⇒ a2 - a1 = a3 - a2
⇒ 4n - 1 - (n - 2) = 5n + 2 - (4n - 1)
⇒ 4n - n - 1 + 2 = 5n - 4n + 2 + 1
⇒ 3n + 1 = n + 3
⇒ 3n - n = 3 - 1
⇒ 2n = 2
⇒ n = 1.
Hence, the value of n = 1.
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