Question

If A is the sum of integer from 1 to 50 and B is the sum of integers from 51 to 100. what is B-A?​

Answer 1

Answer:

2500

Step-by-step explanation:

so

A or B = n/2 (a+l)

n=50 (for both)

a=1 (A) 51 (B)

l=50 (A) 100 (B)

B-A

= (50/2 (51+100))-(50/2 (1+50))

=25 (51+100-1-50)=25×(1+99)

=25×100=2500

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