what is the difference between the sum of the first 20 terms and the next 20 terms of the arithmetic sequence 7 , 11 , 15 ,
Answers
Answered by
1
Answer:
Step-by-step explanation:
a =7
d=4
as we know that twenty first term will be
a+20d
7+20*4=87
so difference between 21st and 1st term will be 80
Answered by
1
Answer:
-525 if it is difference between first 20 and last 20 or 525 if it is difference between net 20 and first 20
Step-by-step explanation:
write it in arithmetic sequence of x variable find sum by using n*(n+1)/2 and then subtract u get the answer
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