Question

Berapa jumlah kelipatan 4 antara 300 dan 500?

Answer 1

Bil kelipatan 4 antara 300 dan 500:
304, 308, .... , 496
a = 304
b = 4
Un = 496

Un = a + (n-1)b
496 = 304 + (n-1)4
496 = 304 + 4n - 4
496 = 300 + 4n
4n = 496 - 300
4n = 196
n = 49

Sn = n/2 (2a + (n-1)b)
S49 = 49/2 (2.304 + 48.4)
       = 49/2 (608 + 192)
       = 49/2 (800)
       = 49 x 400
       = 19.600

semoga membantu ya :)

Answer 2

Barisanya = 304, 308, ..... 496

a = 304
b= 4

un = 496

a + (n-1)b = 496
304 +(n-1)4 = 496
(n-1)4 = 192
n-1 = 192/4
n = 49

Sn = 1/2n ( a+ un)
     = 1/2 x49 ( 304 + 496)
    = 24,5 (800) 
    = 19.600