1+5+9+?..+x =780, then x is
This is reply by AI
@abhishek.exl can you please see this?
Answer should be 20. This is a plain AP with a = 1, and d = 4 n/2 * (2*1 + 4n-4) = 780 n*(4n-2) = 1560 n=20 satisfies
Good approach
@randominbox9 check this
@vibhasingh2004 my pleasure
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1+5+9+?..+x =780, then x is
This is reply by AI
@abhishek.exl can you please see this?
Answer should be 20. This is a plain AP with a = 1, and d = 4
n/2 * (2*1 + 4n-4) = 780
n*(4n-2) = 1560
n=20 satisfies
Good approach
@randominbox9 check this
@vibhasingh2004 my pleasure
mention anyone using @username while adding comments