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Find sum of all two digit …

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Find sum of all two digit whole numbers divisible by 2
  • 1 answers

Himanshu Chanda 6 years, 4 months ago

Two digit no. divisible by 2=10,12,14......98 a=10,d=2,l=98 l=a+(n-1)d 98=10+(n-1)2 98=10+2n-2 98=8+2n 98-8=2n 2n=90 n=45 Sn=n/2{2a+(n-1)d} Sn=45/2{2×10+(45-1)2} Sn=45/2{20+44×2} Sn=45/2{20+88} Sn=45/2×108 Sn=45×54 Sn=2436
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