Advertisements
Advertisements
प्रश्न
The 5th term of an AP is –3 and its common difference is –4. The sum of its first 10 terms is ______.
विकल्प
50
–50
30
–30
MCQ
रिक्त स्थान भरें
Advertisements
उत्तर
The 5th term of an AP is –3 and its common difference is –4. The sum of its first 10 terms is –50.
Explanation:
a + 4d = –3 and d = –4.
So, a = 13.
∴ `S_10 = 10/2 [2a + 9d]`
= 5[2 × 13 + 9 × (–4)]
= –50
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
