Saved Bookmarks
| 1. |
The sum of all multiples of 7 lying between 500 and 1000 |
|
Answer» Answer: 53928 Step-by-step explanation: all multiples of 7 lying between 500 and 1000 is 504,511,518,....994 the above series is in Arthimetic PROGRESSION with COMMON difference 7,no of TERMS,n=72 Therefore Sn=n/2[a+l] Sn= (72/2)[504+994]; =36*1498 =53928 |
|