Question

4. In an A.P., the common difference is 3. first term is then its 10 term is
(A) 27 (B) 29
(C) 30 (D) 28​

Answer 1

Given:

a = 1

d = 3

a10 = a + 9d

= 1 + 9(3)

= 1 + 27

= 28

So option (D) 28 is correct.

Answer 2

Answer:

Given:

a= 1

d=3

• an = a1 +(n-1)d

a 10 = 1+ (10-1) d

= 1 + 9 ×3

= 1+27

t8 = 28

therefore option (D) is correct