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Find the missing number in the series.
16. 1438, 1429, 1417, 1402, ?
Answer (b). The numbers progressively decrease by multiples of 3 starting with 9. Thus 1438 - 1429 = 9, 1429 - 1417 = 12, 1417 - 1402 = 15. 1402 - 17 = 1384.
17. 1, 3, 6, 10, 15, ?
Answer (b). The numbers progressively increase by 2, 3, 4, 5, 6 etc.
18. 8, 17, 36, 75, 154, ?
Answer (b). (8 x 2) + 1 = 17; (17 x 2) + 2 = 36; (36 x 2) + 3 = 75.
19. 10, 100, 200, 310, ?
Answer (d). The difference between successive numbers is 90, 100, 110. Hence the difference between the next number and 310 should be 120. Thus 310 + 120 = 430.
20. 4/12/11, 1/1/12, 29/1/12, 26/2/12, ?
Answer (b). The difference between two consecutive dates is 28 days. Note: 2012 was a leap year.
21. 2, 3, 10, 29, 66, ?
Answer (c). The difference between the numbers is 1, 7, 19, 37. The difference between the numbers so obtained is 6, 12, 18. Hence the difference between the next number and 66 should be 37 + 24 = 61. Thus 66 + 61 = 127.
22. 1, 2, 6, 21, ?
Answer (a). 1 x 1 + 1 = 2; 2 x 2 + 2 = 6, 6 x 3 + 3 = 21; 21 x 4 + 4 = 88
23. 2460, 3570, 4680, ?
Answer (d). Number formed by first 2 digits increases by 11 in each consecutive number, while the number formed by the last 2 digits increases by 10.
24. 7714, 7916, 8118, ?
Answer (a). The first 2 digits are a sequence of odd numbers starting from 77 and the last 2 digits are a sequence of even numbers starting from 14.
Answer (b). The numbers progressively decrease by multiples of 3 starting with 9. Thus 1438 - 1429 = 9, 1429 - 1417 = 12, 1417 - 1402 = 15. 1402 - 17 = 1384.
17. 1, 3, 6, 10, 15, ?
18
21
19
20
Answer (b). The numbers progressively increase by 2, 3, 4, 5, 6 etc.
18. 8, 17, 36, 75, 154, ?
293
313
342
265
Answer (b). (8 x 2) + 1 = 17; (17 x 2) + 2 = 36; (36 x 2) + 3 = 75.
19. 10, 100, 200, 310, ?
400
410
420
430
Answer (d). The difference between successive numbers is 90, 100, 110. Hence the difference between the next number and 310 should be 120. Thus 310 + 120 = 430.
20. 4/12/11, 1/1/12, 29/1/12, 26/2/12, ?
24/3/12
25/3/12
26/3/12
27/3/12
Answer (b). The difference between two consecutive dates is 28 days. Note: 2012 was a leap year.
21. 2, 3, 10, 29, 66, ?
89
99
127
130
Answer (c). The difference between the numbers is 1, 7, 19, 37. The difference between the numbers so obtained is 6, 12, 18. Hence the difference between the next number and 66 should be 37 + 24 = 61. Thus 66 + 61 = 127.
22. 1, 2, 6, 21, ?
88
86
67
62
Answer (a). 1 x 1 + 1 = 2; 2 x 2 + 2 = 6, 6 x 3 + 3 = 21; 21 x 4 + 4 = 88
23. 2460, 3570, 4680, ?
8640
5670
5970
5790
Answer (d). Number formed by first 2 digits increases by 11 in each consecutive number, while the number formed by the last 2 digits increases by 10.
24. 7714, 7916, 8118, ?
8320
8312
8520
8515
Answer (a). The first 2 digits are a sequence of odd numbers starting from 77 and the last 2 digits are a sequence of even numbers starting from 14.