Find the number that can replace question mark (?) in the series given below. 7, 12, 32, 122, ?, 3602, 25202

A602 ✓ Correct

B610

C702

D622

Correct answer: (A) 602

Explanation

The missing number is 602.

Each term uses a rising multiplier with a rising subtraction.

7 x 2 - 2 = 12, 12 x 3 - 4 = 32, 32 x 4 - 6 = 122.

122 x 5 - 8 = 602.

Check: 602 x 6 - 10 = 3602 and 3602 x 7 - 12 = 25202.

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