Elitmus
Exam
Numerical Ability
Number System
Santa has all digit of odd no. Banta has all digit of even no. Santa squares his digit and add them . Banta also squares his digits and add them. Then what is the differnce of the two....
Read Solution (Total 5)
-
- As per gaurav if question was santa has all two digit odd nos and banta has all two digit even nos....
then soln is :
Santa - 11 13 15 17 19 21 ............................................. 99
Banta - 10 12 14 16 18 20 ............................................. 98
we need to calculate
(11^2 + 13^2 + 15^2 + 17^2 + 19^2 + 21^2 ............................................. 99^2 ) - (10^2 12^2 14^2 16^2 18^2 20^2............................................. 98^2 )
OR
= (11^2 - 10^2) + (13^2 - 12^2) + (15^2 - 14^2) + ............................... + (99^2 - 98^2)
= 21 + 25 + 29 + .................................... 197
this is an AP
so sum = n/2(a+l)
= 45/2(21+197)
= 4905 Ans - 9 years agoHelpfull: Yes(14) No(0)
- sq of even no.'s (4+16+36+64+100)
sq of odd no.'s (1+9+25+49+81)
difference is 45 - 9 years agoHelpfull: Yes(4) No(1)
- Difference should be 45
- 9 years agoHelpfull: Yes(2) No(3)
- question was santa hai all two digit odd nos and banta has all two digit even nos....
correct it plz - 9 years agoHelpfull: Yes(2) No(0)
- difference is 55
- 9 years agoHelpfull: Yes(0) No(0)
Elitmus Other Question