Question

Find the missing number in the following number series:405, 135, 45, 15, ?(A) 10
(B) 20(C) 5
(D) 15

Answer 1

c)5 is the answer
this is because you have to subtract the given number with the previous number and divide the answer by 2 and you will get the sa,e number which you have subtracted

405-135= 270
and
270÷2= 135

in the same way

135-45=90
90÷2=45
and go on,


you will get
15-5= 10
and
10÷2 = 5

here you get 5 in both the places
therefore 5 is the answer......

Hope it helps you!!

Answer 2

The missing number is (c) $5$.

Explanation :

The number series is $405, 135, 45, 15, .....$ .

Therefore,

$405/3 = 135\\135/3 = 45\\45/3 = 15\\15/3 = 5$

So, the missing number in the series is option (c) $5$.

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