The missing number is in the 6th position, which belongs to the even-position series.
Calculation: (5 + 1 = 6)
Pattern is -10 each time:
100 - 10 = 90
90 - 10 = 80
80 - 10 = 70
70 - 10 = 60
60 - 10 = 50
Last verified on 12-10-2026
35 + 13 = 48
48 + 15 = 63
63 + 17 = 80
80 + 19 = 99
Rule: Add consecutive odd numbers: 13, 15, 17, 19.
Pattern is +10, +15, +20, +25
10 + 10 = 20
20 + 15 = 35
35 + 20 = 55
55 + 25 = 80
Last verified on 11-10-2026
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