Question

Complete the series
7,9,12,48,?,890

Answer 1

Series Pattern Given Series

7 7

7 × 1 + 1 × 2 9

9 × 2 – 2 × 3 12

12 × 3 + 3 × 4 48

48 × 4 – 4 × 5 172 ✓

172 × 5 + 5 × 6 890

Answer 2

Answer:

172

Step-by-step explanation:

The given series is

7,9,12,48,?,890

We need to find the missing number.

$7\times 1+1\times 2=7+2=9$         (Multiply 1 add product of 1 and 2)

$9\times 2-2\times 3=18-6=12$         (Multiply 2 subtract product of 2 and 3)

$12\times 3+3\times 4=36+12=48$         (Multiply 3 add product of 3 and 4)

Using similar pattern, we get

$48\times 4-4\times 5=192-20=172$         (Multiply 4 subtract product of 4 and 5)

$172\times 5+5\times 6=860+30=890$         (Multiply 5 add product of 5 and 6)

Therefore, the missing number is 172.