11+12+13+14+15+16+17+18+19=100

but we want only those numbers we have given without  a o in squence 11+12+13+14+15+16+17+18+19 it should be 100, please do this sum
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1 Answer

yu hav arithmetik sequens (progresshun)

start=11, step size=1, num terms=9

sum=135 & averaej=15

avereaj=(first+last)/2=(11+19)/2=30/2=15

sum=n*averaej=9*15=135

nuther wae tu look at it...11+19=30, 12+18=0, ets

so yu hav 3*30+15=120+15=135
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