1.

Which term of the A.P. 4, 9, 14, ...... is 254?

Answer»

a = 4, d = 5

An = a + (n – 1) d

254 = 4 + (n – 1) 5

254 = 4 + 5n – 5

254 = -1 + 5n

255 = 5n

n = 51



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