Question

Find the sum of integers which are divisible by 5 from 1 to 100.
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Answer 1

Answer:

5,10,15,20,25,30,35,40,45,50,55,60,65,70 75,80,8590,95,100

Answer 2

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Proper Method:

Required ap=5,10.....100

Nth term=a+(n-1)d

Here nth term=100

A=5..d=5

Therefore n=20

Sum=20/2[5+100]

10×105

1050

Improper Method (if comes in MCQ's):

5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100

5+10+15+20+25+30+35+40+45+50+55+60+65+70+75+80+85+90+95+100

75+200+325+350+100

1050