The sum AP with rule

Find the sum of all natural numbers between 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 = 2n1   (a50+a1) s1=250 (100+2)=2550  s2 = 5(1 + 3 + 5 +  + 19) s2 = 2n2   (b19+b1) s2=210 (95+5)=500  s=s1+s2=2550+500=3050



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