There are 8 pebbles, 7 of these have exactly mass, but there is 1 pebble whose mass is greater. If you have given with a taraju (weight mapper). How many times do you need to weight & to find out the pebble with having excesses mass.
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Answer:
2 times
explanation ->
Step 1. measure any 3 pebbles with another 3 pebbles
3<--->3 , keep 2 aside
Step 2. from the above measure you will have either
a. set of 3 pebbles with heavier weight
-> if this is the case then measure any 1 pebble with another 1 pebble
1<------>1 , keep 1 aside
from above
| either you will have heavier pebble in
| measurement or the one kept aside
Hence, total of 2 times we have used weight mapper
b. or 2 pebbles kept aside will have heavier weight
| measure 1 pebble each with weight mapper
| and we will get heavier pebble
Hence, total of 2 times we have used weight mapper
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