Question

how many terms of the A.P. 9, 17, 25,.. must be taken so that sum is 693.

please step by step...
sorry to disturb​

Answer 1

Step-by-step explanation:

You need to find n

a1=9

d= 17-9

=8

Sum of n terms=693

Sn= n ×[2a+(n-1) d]

2

693= n ×[2×9+(n-1) ×8]

2

693= n ×[18 + 8n-8]

2

693= n ×(10+8n)

2

1386=10+8n

1376=8n

1376 =n

8

n=172

I hope I answered your question.Sorry if I am wrong

Answer 2

Answer:

hi roshni will u send link at 9.30