Question

Find the sum of all natural numbers between 100 and 300 [(a) including both of these, and (b) excluding
both of these] :
(1) Which are exactly divisble by 4.
(ii) Which are exactly divisible by 5.​

Answer 1

Answer:

(i)a=104 d=4 an=208

an=a+(n-1)d

208=104+(n-1)4

104÷4=n-1

26+1=n

n=27

sn=n/2(a+an)

27/2(104+208)

27/2×312

27×156

4212

Step-by-step explanation:

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