Find the sum of the natural number with in two digit
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Answer:
Sum of two digit natural numbers
Step-by-step explanation:
Two digit numbers starts from 10 and ends with 99
10+11+12………..+99
a=10, d=1
an=a+(n-1)d
99=10+(n-1)1
89=n-1
n=90
S90=90÷2(2+89)=45*91=4095
Answered by
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Answer:
22+22=44 this is the answer
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