The difference between the sum of the first 15 odd natural numbers and the sum of the first 15 even natural numbers is
a. 1
b. 15
3. 30
4. 45
Answers
Answered by
0
Step-by-step explanation:
the sum of first 15 even number= 225
the sum of first 15 odd number = 210
the difference = 15
Answered by
1
Answer:
15
Step-by-step explanation:
let the AP of first odd numbers be 1, 3,5 ....
a=1 , d=2 ,n =15
AP of forst even number be 2, 4,6 ...
a=2 ,d=2, n=15
sum of odd numbers
S= 15/2 [2 +14(2)]
= 15/2 [28+2]
= 15/2(30)
=15×15
=225
sum of even numbers
S= 15/2[4+14(2)]
= 15/2(4+28)]
=15/2(32)
= 15 ×16
= 240
difference between them,
225-240=15
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