Question

In an ap the third term is 3 and 1th term is -21, find the first term and common difference

Answer 1

Answer:

6. The 26th, 11th and the last term of an AP are 0, 3 and -

, respectively. Find the

common difference and the number of terms.

A

1th

Step-by-step explanation:

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Answer 2

Answer:

a=-3 d=3

Step-by-step explanation:

3rd term. = 3

11th term = -21

Let first term be = a

and common difference be. = d

T3=. a+(n-1)d

T3=a+2d

3=a+2d--------------------------------(i)

T11= a+(n-1)d

T11= a+10d

-21=a+10d----------------------------(ii)

Subtracting (I) from (ii). we get

24=8d

d=3

putting the value of d in (i)

3 =a+2*3

3=a+6

a=-3

Hence a =-3and d=3