Leon makes up a sequence of numbers. He starts with the number 4. Each number after 4 is 2 less than 5 times the previous number. The fifth number in Leon's sequence will be:
A 2188 B 324 C 496 D 1294
2007-01-16 14:03:20 · 6 answers · asked by shencock2000 1 in Science & Mathematics ➔ Mathematics
4,18,88,438,2188.
Choose A.
2007-01-16 14:12:11 · answer #1 · answered by Wolfshadow 3 · 0⤊ 0⤋
Suppose the first number of the sequence is a1,so the fifth is a5
Let's see..a1=4 a2=4*5-2 a3=(4*5-2)*5-2=4*5^2-2*5-2...
a5=4*5^4-2*5^3-2*5^2-2*5-2=2188 Choose A
Actually,you could use the formula to calculate an after writing a1.a2,a3
an=4*5^n-1-2[5*(5^n-2-1)/(5-1)]-2 when n=5,the answer is also 2188
2007-01-16 22:25:44 · answer #2 · answered by cleareye328 2 · 0⤊ 0⤋
A. 2188
2007-01-16 22:09:39 · answer #3 · answered by Anonymous · 0⤊ 0⤋
4,18,88, 438, 2188
A) 2188 is the correct answer
2007-01-16 22:09:20 · answer #4 · answered by pam3la 1 · 0⤊ 0⤋
A is correct
2007-01-16 22:12:11 · answer #5 · answered by BJGPP 2 · 0⤊ 0⤋
It will be A
2007-01-16 22:10:07 · answer #6 · answered by pincdragon 2 · 0⤊ 0⤋