Math, asked by devivsidevi, 2 months ago

find the sum of all two digit numbers​

Answers

Answered by BrainIyBaka
1008

Answer::

Sn = n/2 [a+l]

first 2 digit number (a) = 10, last number(l) = 99, no.of digits from 10 to 99 = 90

Sn = 90/2 [10+99]

Sn = 45(109)

Sn = 4905

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