378 trees planted in row in the shape of an isosceles triangle, with the number in successive rows decreasing by one from the base on to the top. How many trees are there in the rope which forms the base of the triangle?

A ) 26

B ) 27 ✅

C ) 28

D ) 24

Related Questions
  1. Find the 15th term of the sequence 20 ,15 ,10,___________.
  2. Mean of 7 number is 40, what is the sum of these number?
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