1.

If for any A.P. d = 5, then t18 – t13 = …. (A) 5(B) 20 (C) 25 (D) 30

Answer»

The correct answer is : (C) 25

Hints :  

t18 - t13 = a + (18 - 1)d - [a + (13 - 1)d]

= a + 17d - a - 12d

= 5d = 5 x 5 = 25



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