Question
If 2 is added to each odd digit and 1 is subtracted from
each even digit in the number 8763154, how many digits will appear more than once in the new number thus formed?Solution
Original number: 8 7 6 3 1 5 4
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8 (even) → 8 − 1 = 7
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7 (odd) → 7 + 2 = 9
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6 (even) → 6 − 1 = 5
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3 (odd) → 3 + 2 = 5
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1 (odd) → 1 + 2 = 3
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5 (odd) → 5 + 2 = 7
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4 (even) → 4 − 1 = 3
New number: 7 9 5 5 3 7 3 Frequencies: 7 → 2 times, 9 → 1, 5 → 2, 3 → 2.
Digits that appear more than once: 7, 5, 3 — that's 3 digits.
What will come in place of the question mark (?) in the following series?
121, 110, 97, ?, 61, 38
23, 39, 64, 100, ?, 213
16, 17, 35, 106, 425, ?
119 × 13 + 150/100 × 850 =?
4, 5, 11, 34, 137, ?
1 12 31 58 93 ?
What will come in place of the question mark (?) in the following series?
7, 20, 59, 176, 527, 1580, ?
18, 30, 54, 90, 138, ?
What will come in place of (?) question mark in the given number series.
12, 27, 44, 65, ?, 139
5, 5, 15, 75, ?, 4725
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