Question

which term of an AP:21,42,63,84 _____ is 210
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Answer 1

Answer:

here , a= 21 , d= 42-21 = 21 , An= 210 and we have to find n = ??

Step-by-step explanation:

we know that, An = a +(n-1) d

210 = 21 + ( n-1)21

189 = 21n- 21

210 = 21n

n = 210/21

n = 10

that's the 10th term of this AP is the 210

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