CBSE Class 10 Answered
Solve the equation -2+5+8……+x =155
Asked by poojathally | 06 Mar, 2010, 09:54: AM
Expert Answer
2+5+8……+x = 155
LHS is an AP with first term 2 and common difference 3
Sum to n terms is [ n/2(4+(n-1)3]=155
n(1+3n)=155x2
3n2+n-310=0
Solve this equation to get n
use 2+3(n-1) to get x
Answered by | 06 Mar, 2010, 12:27: PM
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