Question

What is tha next number in the series 700 , 1400 , 4200 ,???
a)5600
b)8400
c)16800​

Answer 1

Every succeding number is multiplied by x(n+1)

where,

x = preceding number

n = Number by which second previous number was multiplied with to get previous number.

In the starting, value of n = 2

1400=700×2
4200=1400×(2+1)
16800=4200×(3+1)

Hence, the order is

700,1400,4200,16800,84000.

Answer 2

$\sf\underline{Step-by-step \: explanation}$

In the series, the order is,

• 700

• 1400

• 4200

Notice,

¤ 700 × 2 = 1400

¤ 1400 × 3 = 4200

☆ 4200 should be multiplied by 4 to get the next number.

Accordingly,

The next number in the series should be,

4200 × 4 = 16800

Hence, the next number in the series should be, $\huge\underline{Option \: C \: , \: 16800}$