1+2+3+..........+50=?
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a=1,,,,,,,,,,d=2-1=1
An=a+(n-1)d
50=1+(n-1)1
after solving
n=50
Sn=n/2{2a+(n-1)d}
=50/2{2(1)+(50-1)1}
=25{2+49}
=25(51)
=1275
hope i answered correctly
An=a+(n-1)d
50=1+(n-1)1
after solving
n=50
Sn=n/2{2a+(n-1)d}
=50/2{2(1)+(50-1)1}
=25{2+49}
=25(51)
=1275
hope i answered correctly
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