sum of those integers from 1 to 500 which are multiples of 2 or 5
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Answered by
356
multiples of 2
2,4,6.................500
a=2
d=4-2=2
l=500
n=500/2=250
Sn=250/2(2+500). Sn=n/2(a+l)
150(502)
=62750
multiples of 5
5,10,15.............500
a=5
l=500
n=500/5=100
Sn=100/2(5+500)
=50(505)
=25250
10 multiples are common
10,20,30...........500
a=10
l=500
n=500/10=50
Sn=50/2(10+500)
= 25(510)
= 12750
n= 62750+25250-12750
= 75750
2,4,6.................500
a=2
d=4-2=2
l=500
n=500/2=250
Sn=250/2(2+500). Sn=n/2(a+l)
150(502)
=62750
multiples of 5
5,10,15.............500
a=5
l=500
n=500/5=100
Sn=100/2(5+500)
=50(505)
=25250
10 multiples are common
10,20,30...........500
a=10
l=500
n=500/10=50
Sn=50/2(10+500)
= 25(510)
= 12750
n= 62750+25250-12750
= 75750
chiyayadav24:
sorry its 75250
Can u tell why it is done so
See question is multiples of 2 or 5
Can't ap be like 10 20 ....
As these r common to 2 and 5 both
Answered by
74
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hope this helps
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