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Des : 1

a=5

d=8-5=3

n=?

So

x=a+(n-1)d

383=5+(n-1)3

378=(n-1)3

n-1=(378÷3)

n-1=126

n=127

Des : 2

সমান্তর ধারার n তম পদ = a +(n -1)d

ধরি, n তম পদ=383

প্রশ্নমতে, a +(n -1)d=383

=> 5+(n-1)3=383

=> 5+3n-3=383

=> 3n+2=383

=> n=381/3

so, n=127

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