Question

2,7,4,5=100
2,7,3,6=??
4,9,8,7=400
(a)194 (b)190 (c) 198 (d) 200​

Answer 1

Given:

• A series is given

            2,7,4,5=100

            2,7,3,6=??

            4,9,8,7=400

To Find:

• Missing number in the series

Solution:

Following pattern is used in this series

• First square the even number present in the series and add them.
• The result is multiplied by 5.

Now according to the above pattern

               ⇒ 2, 7, 4, 5 = 100

                    2²+ 4² = 4 + 16 = 20 × 5 = 100

              ⇒ 4, 9, 8, 7 = 400

                    4² + 8² = 16 + 64 = 80 × 5 = 400

Now,

               ⇒ 2, 7, 3, 6 = ??

                    2² + 6² = 4 +36 = 40 × 5 = 200

Thus, the missing number is 200