Question

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1 + 2 + 3 + 4 + 5....+ 75 =
2 + 3 + 4 + 6 ..... 15 =

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Answer 1

Nomor SatuSn = n/2 ( 2a + ( n - 1 ) b )Sn = n/2 ( 2a + ( n - 1 ) ( U2 - U1 ) )S75 = 75/2 ( 2(1) + ( 75 - 1 ) ( 2 - 1 ) )S75 = 75/2 ( 2 + 74 ( 1 ) )S75 = 75/2 ( 76 )S75 = 75 × 38S75 = 2.850_____________________Nomor DuaSn = n/2 ( a + Un )S15 = 14/2 ( 2 + 15 )S15 = 14/2 ( 17 )S15 = 238/2S15 = 119[tex]\purple{\boxed{\green{\boxed{\red{\tt{\ \: \red{{» By : \: XxDarknessxX࿐ }}}}}}}}[/tex]