Math, asked by happiestnaushi, 11 months ago

श्रेणी 5, 7, 9..............के कितने पदों का योग 1020 होगा।'​

Answers

Answered by ashutoshmishra0530
2

Step-by-step explanation:

a=5

d=7-5=2

Sn=1020

Sn=n/2[2a+(n-1)d]

1020=n/2[2*5+(n-1)2]

1020=n/2[10+2n-2]

1020=n/2(8+2n)

2n^2-2n+1020=0

n^2-n+520=0

(n-1)(n-520)

n=1 or n=520

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