Question

Jumlah bilangan kelipatan 2 antara 100 sampai 300 brapa kak ???
mohon pakai cara ya

Answer 1

A = 102
b = 2
Un (terakhir) = 298

Un = a + (n-1)b
Un = 102 + (n-1)2
Un = 102 + 2n - 2
Un = 100 + 2n

298 = 100 + 2n
298 - 100 = 2n
198 = 2n
99 = n

Sn = n/2 (a+Un)
S99 = 99/2 (102 + 298)
S99 = 49,5 (400)
S99 = 19.800

Answer 2

A = 102
b = 2


Un = a + ( n - 1 ) 2
298 = 102 + 2n - 2
298 = 100 + 2n
2n = 298 - 100
n = 198/2
n = 99

Sn = n/2 ( 2a + ( n - 1 ) b )
S99 = 99/2 ( 2.102 + ( 99 - 1 ) 2 )
       = 99/2 ( 204 + ( 98 ) 2 )
       = 99/2 ( 204 + 196 )
       = 99/2 ( 400 )
       = 19.800