Question

) 210 is the ..... term of the A.P. 21, 42,63,84,....
(a) 10° (6) 11" (c) 12" (d) 13"​

Answer 1

Answer:

a is the corect answer

Step-by-step explanation:

tn = a+ ( n–1 ) d

210=21 x(n–1) 21

210 = 21 + 21n – 21

210 = 21n

n = 210/ 21

n = 10

Answer 2

Answer:

It is 10th term as An = a +(n-1)(d).

Here a = 21 d = 21