Campus
Maths Puzzle
Numerical Ability
a + a^1 +a^2+......+a^28 =?? if a=3
Read Solution (Total 2)
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- a + a^1 +a^2+......+a^28
= a +(1+ a^1 +a^2+......+a^28)-1
= a + (a^29 -1)/(a-1) - 1
= 3 + (3^29 -1)/(3-1) -1
= 2 + (3^29 -1)/2 - 10 years agoHelpfull: Yes(3) No(0)
- 3+sum of GP terms.
3+3(3^28-1)/(3-1)=34315188682443. - 10 years agoHelpfull: Yes(0) No(1)
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