How many digits are there in the square of 72?

There are two cases, (i) First digit is greater than 2 (ii First digit is 2 Case : (i) First digit can be chosen from 3,4,5,6 so 4 possibilities, then next 3 digits can be selected from any 6 digits. = 4 × 6 ×...

There are two restrictions operating this question. 1.  For a number to be odd, the unit digit should be either 1,3,5,7 or 9. 2. Thousand can not be filled with 8 or...

Correct option is (A) 1/10 Total two-digit number is n(S) = 99 - 9 = 90 2-digit numbers whose units & ten’s places have same digits are 11, 22, 33, 44, 55, 66, 77, 88 and...

A) Red data book

A(10), B(11), C(12), D(13), E(14), F(15)

largest two digit no. divisible by 3 = 99 . Smallest two digit no. divisible by 3 = 12 . Now,  a1 = 12 a2 = 15 And  d  = (15 - 12)  ⇒ 3  Let an = 99 We...

(i) There will be as many ways as there are ways of filling 3 vacant places in succession by the given five digits. In this case, repetition of digits is...

Correct Answer - D `{:(3,5,6,4,1,8,7,2),(,,,"|",,,"|",),(1,2,3,4,5,6,7,8):}`