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23 Αυγ 2017 · What is 1 + 2 + 3 + ....... + 99 + 100 equal to? Also what is a quick method to solve this? Precalculus. 1 Answer. Ratnaker Mehta. Aug 23, 2017. 5050. Explanation: Observe that, 1 + 2 + 3 + 4 + ... +50 +51 + ... +97 +98 + 99+ 100, = (1 +100) + (2 +99) + (3 + 98) +(4 +97) + ... +(50+ 51), = (101) +(101) +(101) +(101) +... + (101),......(50 terms)
1 + 2 + 3 + . . . . + 99 + 100 = ? But we should rearranged the numbers to add them like this: (1 + 100) + (2 + 99) + (3 + 98) + . . . . + (50 + 51) = ? If you notice every pair of numbers adds up to 101. There are 50 pairs of numbers, so the answer is 50*101 = 5050.
Find missing number from sum of first few natural numbers. https://math.stackexchange.com/questions/264947/find-missing-number-from-sum-of-first-few-natural-numbers. We have 1+2 +3+⋯+n = 2n(n+1). The numbers obtained from such sums are called Triangular numbers .
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25 Αυγ 2020 · Answer. Answer: first, make them all hundred like 100, 99+1, 98+2, 97+3. when you make them count the times of hundred and multiply them by hundred. Step-by-step explanation:
