A student taking test consisting of 10 quetions is told that each after the first is worth 2 mks more than the preceding ques. If 3rd ques. of the test is worh 5 mks..,what is the maximum score that the student can obtain by attempting 8 questions.

Hi!
Here is the answer to your question.

The maximum marks can be scored by obtaining full marks from 3rd to 10th questions.

Here, a = 5, d = 2, n = 8
[Marks to 3rd question = 5, 10th question is 8th term when first term is 3rd question]
 

So, maximum mark that the student can obtain

 

 
Best wishes!

  • 10

64 marks

  • -6

given, a3= 5, d= 2, n= 8.

a3 = a+2d  .: 5 = a + 2*2  .: a = 5-4 = 1

S8= 8/2 [ 2*1 + (8-1)2] = 4 [ 2+ 14 ] = 64.

  • -4

 cn u tell us

  • -6

 64

  • 0
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