Question

Jumlah bilangan kelipatan 4 antara 200 dan 400 !

Answer 1

N/2(2a+(n-1).b)
=49/2(2.204+ (49-1).4)
=49/2(408+48.4)
=49/2(408+192)
=49/2(600)
=49×300
=14.700

semoga membantu

Answer 2

Kelipatan 4 antara 200 dan 400 adlh 204, 208, 212, ... , 396.
a = 204
Un = 396.
Un = a + (n-1)b
396 = 204 + (n-1)4
396 = 204 + 4n - 4
4n = 396-204+4
4n = 196
n = 64
S24 = n/2 ( a+ Un)
= 64/2 (204+396)
= 32x600
= 19200