if the alphabets are written in the sequence of a bb ccc dddd eeeee ffffff …. what will be the 120th letter?
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Answer:
o
Step-by-step explanation:
alphabet are written in increasing number of alphabet every time.
there is series of 1,2,3,4 ..... and so on
as we have to find 120th letter of this series . we found the sum of that A.P.
so
120 = n(n+1) / 2
⇒240=n²+n
⇒n²+n-240=0
⇒n²+16n-15n-240=0
⇒n(n+16)-15(n+16)=0
⇒(n+16)(n-15)=0
n= 15 , -16
as -16 is not possible so n= 15
so 15th letter of alphabetical series will be 120th letter which is 'o'
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