1.

Find n if the given value of x is the nth term of the given A.P.-1, -3, -5, -7, …; x = -151

Answer»

Given A.P. -1, -3, -5, -7, …., -151

Here, a = -1 d = -3 – (-1) = -2

Last term (nth term) = -151

We know that an = a + (n – 1)d

⇒ -151 = -1 + (n-1)(-2)

-151 = -1 – 2n + 2

n = 152/2

n = 76



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