divisible by 7.
• 14. Find the sum of first forty positive integers divisible by 6.
15. Find the sum of the first 15 multiples of 8s
[CBSE 2012]
[CBSE 2012]
16 Find the sum of
multinle
ing hotion 300 and 700
Answers
Answered by
1
Step-by-step explanation:
14. We know that the first 40 positive integers divisible by 6 are 6,12,18,....
This is an AP with a = 6 and d = 6.
S40= 20[2(6) +(40-1)6] =20[12+234] =4920.
15. The multiples of 8 are 8,16,24,32…
These are in an A.P., having first term as 8 and common difference as 8.
Therefore, a=8,d=8,
and then the similar process, and the answer is
960
16
Similar questions