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write the sum of first fifteen natural number

Posted by Shreyansh Singhania 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Affu 😊 6 years, 10 months ago

Sn=?... an,l=15 & a=1 .... Sn=n/2(a+l) .... sn=15/2(1+15)..... Sn=15/2(16).....Sn=15x8......Sn=120

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Affu 😊 6 years, 10 months ago

120

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CBSE > Class 10 > Mathematics