Number Series Completion - Study Mode

[#71] 14, 28, 20, 40, 32, 64, ... What number should come next?
Correct Answer

(B) 56

Explanation

Solution: This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.

[#72] Find the missing term : 3, 5, 35, 10, 12, 35, _ , _
Correct Answer

(B) 17, 19

Explanation

Solution: Every 3rd multiple of the given series is constant and the rest of the series is as follow as showing in below image

[#73] Find the missing term : 7, 8, 18, 57, ?, 1165
Correct Answer

(B) 232

Explanation

Solution: 7 × 1 + 1 = 8 8 × 2 + 2 = 18 18 × 3 + 3 = 57 57 × 4 + 4 = 232 232 × 5 + 5 = 1165

[#74] Find the missing term: 0, 4, 6, 3, 7, 9, 6, ?, 12
Correct Answer

(B) 10

Explanation

Solution: The given sequence is a combination of three series: I. 0, 3, 6 II. 4, 7, ? III. 6, 9, 12 The pattern in each of these series is + 3 So, missing term = 7 + 3 = 10

[#75] In the series 3, 9, 15,.............what will be the 21st term?
Correct Answer

(C) 123

Explanation

Solution: Clearly, 3 + 6 = 9, 9 + 6 = 15,............. So, the series is an A.P in which a = 3 and d = 6 ∴21st term = a + (21 - 1)d = a + 20d = 3 +20 × 6 = 123.