TCS
Company
Numerical Ability
Arithmetic
.A series of books was published at 10years intervals when the 10th book was issued the sum of publication years was 19,560when was the 1st book published
a)1910 b)1914 c)1911 d)1909
Read Solution (Total 4)
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- ans is 1911
here d=10
sn=19560
n=10
we have to find a
so sn=n/2(2a+(n-1)d)
now put values
19560=10/2(2a+9*10)
after solving we get a=1911
- 9 years agoHelpfull: Yes(4) No(1)
- 19560=10/2[a+a+(10-1)*10]
19560=5[2a+90]
19560-450=10a
a=19110/10
a=1911 - 9 years agoHelpfull: Yes(3) No(1)
- 19560 is the answer
- 9 years agoHelpfull: Yes(0) No(10)
- Answer is 1911
- 4 years agoHelpfull: Yes(0) No(0)
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