Find the sum

Find the sum of all natural numbers from 1 and 100, which are divisible by 2 or 5

Correct answer:

s =  3050

Step-by-step explanation:

2,4,6,8,,100 5,10,15,,100  s1=2 (1+2+3+4+50) s1=n12 (a50+a1) s1=502 (100+2)=2550  s2=5(1+3+5++19) s2=n22 (b19+b1) s2=102 (95+5)=500  s=s1+s2=2550+500=3050



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