Math, asked by yesiplaygames, 1 month ago

Q19. Find the sum of the: (a) first 50 even numbers

Answers

Answered by uttamsingh58
1

even number =2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50

l=a+(n-1)d

50=2+(n-1)2

50=2+2n-2

50=2n

n=25

Sn=n/2[2a+(n-1)d

Sn=25/2[2×2+(25-1)2

Sn=25/2[4+48]

Sn=25/2×50

Sn=25×25

Sn=625

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