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78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.
20
no, these are the first 20 triangle numbers: 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 210
78
78
78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.
20
no, these are the first 20 triangle numbers: 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 210
In Pascal's Triangle, each number is the sum of the two numbers directly above it. Row 13 in Pascal's Triangle would start with the number 1, followed by the numbers 13, 78, 286, 715, 1287, 1716, 1716, 1287, 715, 286, 78, 13, and finally 1. These numbers represent the coefficients of the terms in the expansion of (a + b)^13.
The next two numbers are 26 & 78.
{| |- | 78 69 60 51 42 33 |}
The number which can go into 78 and 20 is the GCD of the two numbers which is 2.
The next number is 20.
78
78
No, 23 is not a triangular number. Here are a few examples of triangular numbers: 21, 28, 55, 45, 78 and 91.
20 + 78 = 98