Question

Given that a=8 án=62 sn=210

Answer 1

Answer:

In an AP, given a=8,a  

n

​  

=62,S  

n

​  

Step-by-step explanation:

=210m find n and d.

December 20, 2019

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Maitreya Abhijit

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ANSWER

a=8,a  

n

​  

=62,s  

n

​  

=210

a  

n

​  

=a+(n−1)d

62=8+(n−1)d

54=(n−1)d

s  n =  2 n

​ [2a+(n−1)d]

210=  2 n

​ [16+(n−1)d]

420=n[16+54]

420=70n

n=6

54=(6−1)d

d=  

5

54

​