Question

find the sum of the first 20 positive integers divisible by 2​

Answer 1

$\huge\underline{\overline{\mid\star{\sf{\pink{S∅LūTīøÑ}}\star\mid}}}$

The first 20 positive integers are ...

2,4,6,8,,10,12,14,16,18,20,22,24,26,28,30,32,34,36,40,42

so all are in a A.P.

here, a = 2. d=2. n=20

so, Sn = n/2 {2a+(n-1)d}

=> S20 = 20/2 {2×2 +19× 2}

= 10×42

= 420.

so the answer is 420

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