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i think OA D first 111 prime nos = only 1 even prime (2) + 100 odd primes...
addiing 100 odd nos => 1st odd + 2nd odd = even + 3rd odd = odd + 4th odd = even thus on adding 2nd number = e 3rd numer = o 4th number = e 5th number = o....this trend contd....on adding each even numbered digit you get result even....thus....on adding 100th digit we get even result ...then adding odd (2) will result in e+e = e.....hence x is even
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i think OA D
ReplyDeletefirst 111 prime nos = only 1 even prime (2) + 100 odd primes...
addiing 100 odd nos =>
1st odd + 2nd odd = even + 3rd odd = odd + 4th odd = even
thus on adding
2nd number = e
3rd numer = o
4th number = e
5th number = o....this trend contd....on adding each even numbered digit you get result even....thus....on adding 100th digit we get even result ...then adding odd (2) will result in e+e = e.....hence x is even
hence eqn becomes 1-1+1-1+1 = 1..OA D
Yep, answer is D, good job Bhushan, they key is to see that x is even, as you said, and then you have +1 -1 + 1 -1 +1 = 1
ReplyDelete