Question

Write an A.P. whose first term is a and common difference is d in each of the following :

a=-1.25, d=3

Answer 1

Solution :

Given First term in A.P = a = a1 = -1.25

common difference (d) = 3

second term = a + d

a2 = -1.25 + 3 = 1.75

Third term = a + 2d

a3 = -1.25 + 2 × 3

= -1.25 + 6

= 4.75

nth term = a + ( n -1 )d

= - 1.25 + ( n - 1 )3

= -1.25 + 3n - 3

= 3n - 4.25

Therefore ,

Required A.P is

-1.25 , 1.75, 4.75 , ....., ( 3n - 4.25 )

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