Question
If you write down all the numbers from 1 to 100, how
many times will you write the number 9?Solution
We’ll count how many times 9 appears in: Tens place Units place Tens place: Numbers like: 90, 91, 92, 93, 94, 95, 96, 97, 98, 99
That's 10 numbers with 9 in the tens place. → 10 occurrences Units place: Numbers ending in 9: 9, 19, 29, 39, 49, 59, 69, 79, 89, 99
→ 10 numbers with 9 in the units place → 10 occurrences So from 1 to 99, digit 9 appears = 10 (tens) + 10 (units) = 20 times
In which of the following expressions will the expression ‘S > R’ and ‘W < T’ be definitely false?
Statement: L ≥ X ≤ Z > Y ≤ A, Y = B ≥ C
Conclusion: I. C >A II. A ≥ C
Statements: X @ Y $ Z & U, Z @ V
Conclusions: I. V # X II. V $ X
...Statements: M % N, N & A, A @ B, B # C
Conclusions: I. C & A II. M # B
...In the question, assuming the given statements to be true, find which of the conclusion (s) among given two conclusions is /are definitely true and the...
Which of the following symbols should replace the question mark (?) in the given expression in order to make the expressions B ≤ D as well as F > B de...
Statement: J < L; J ≥ H > K; L ≥ F > M
Conclusion:
I. K ≥ L
II. F ≥ J
Statements: L < E; M = O; E >K ≥ M
Conclusions:
I. L < M
II. K = O
In which of the following expressions will the expression ‘M ≥ N ' and ‘Q < O’ be definitely true?
In the question, assuming the given statements to be true, Find which of the conclusion (s) among given three conclusions is /are definitely true and t...
