Question

Find the next number in the series 700;1400;4200;_?

Answer 1

Here is your answer.
700,1400,4200,16800..

Hope it helps you.
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Answer 2

$\boxed{\textbf{16800}}$

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.

$1400 = 700 \times 2\\4200 = 1400 \times (2+1) = 1400 \times 3\\16800 = 4200 \times (3+1) = 4200 \times 4$

Hence, the order is

700,1400,4200,16800,84000.....