10419015
| Pregunta | Respuesta |
| Divisibility Test 1) 4 2) 7 3) 8 4) 9 5) 11 6) 12 7) 13 | 1) Last 2 digit divisible by 4 2) 2x last digit, subtract 4m rest ==> x7 3) last 3 digit divisible by 8 4) sub of digits divisible by 9 5) Diff of even & Odd position ==> x11 6) Divisible by 3 and 4 7) x4 last digit, sum wid rest,==> x13 |
| 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 ... | 1^2 = 1 2^2 = 1 + 3 3^2 = 1+ 3 + 5 4^2 = 1 + 3 + 5 + 7 . . 1 + 3 + 5 + 7 + 9 ... = N^2 |
| Power Cycles and Remainder Last digit of 2^55 ?? | Pattern of last digit = 1, 4, 8, 6 55%4 = 3 2^3 = 8 |
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