Questions
Let m and n be two digit natural numbers. The number of pairs such that can be subtracted from m without borrowing is:
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a
2475
b
2550
c
2675
d
2875
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Correct option is A
Suppose m=10a+b and n=10c+d where 1≤a,c≤9 and 0≤b,d≤9.Note that 0≤d≤b Thus d can take (b+1) values. Similarly, 1≤c≤a, therefor, c can take a values. Hence, the required number of pairs (m,n) is (1+2+…+10)(1+2+…+9)=2475Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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