Question

The sum of all natural numbers from 1 to 25

Answer 1

First term=a=1
Last term =25
No. of terms=25

Arithmetic Progression Formula for sum of numbers = S = n/2(a + l)



S = 25/2(25 + 1)
= 25 × 13
=325

Answer 2

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1,2...25

a=1

d=1

an=25

Sn=25/2{2(1) +24(d)}

Sn = 25/2{2+24}

Sn =25/2*26

sn =25*13

=325