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Numerical Ability
Arithmetic
starting with number 3,repeat 30 times the operation of doubling and substracting then you get a)231+1 b)3*231 c)231-1 d)3*230
Read Solution (Total 3)
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- After 1st operation, 3*2 - 1 = 5, which is 2^2 + 1
After 2nd operation, 5*2 - 1 = 9, which is 2^3 + 1
After 3rd operation, 9*2 - 1 = 17, which is 2^4 + 1
and so on
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so after 30th operation 2^31+1 (ans)
- 8 years agoHelpfull: Yes(24) No(1)
- After 1st operation, 3*2 - 1 = 5, which is 2^2 + 1
After 2nd operation, 5*2 - 1 = 9, which is 2^3 + 1
After 3rd operation, 9*2 - 1 = 17, which is 2^4 + 1
and so on
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.
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so after 30th operation 2^30+1 (ans) - 8 years agoHelpfull: Yes(5) No(5)
- a)2^31+1
- 8 years agoHelpfull: Yes(1) No(0)
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