Find the sum of 25+28+31.....100? give the answer through arithamatic progration
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a=25,d=3,an=100
an=a+(n-1)d
100 =25+(n-1)3
100-25=(n-1)3
n-1=75/3
n-1=25
n=26
sn=n/2(2a+(n-1)d)
=26/2(2x25+(26-1)3)
=13(50+25x3)
=13(50+75)
=13x125
=1625
an=a+(n-1)d
100 =25+(n-1)3
100-25=(n-1)3
n-1=75/3
n-1=25
n=26
sn=n/2(2a+(n-1)d)
=26/2(2x25+(26-1)3)
=13(50+25x3)
=13(50+75)
=13x125
=1625
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