TCS
Company
Numerical Ability
Sequence and Series
the sum of 2nd and 19th term of A.P. is equal to the sum of 8th , 15th and 12 th term . find the term which is 0
Read Solution (Total 5)
-
- t2 + t19 = t8 + t15 + t12
=> a+d + a+18d = a+7d + a+14d + a+11d
=> a + 13d = 0
=> t14 = 0 i.e. 14th term is zero. - 9 years agoHelpfull: Yes(33) No(3)
- ans>14
A2=a+d
A19=a+18d
A8=a+7d
A15=a+14d
A12=a+11d
A2+A19=A8+A15+A12
=>2a+19d=3a+32d
=>a+13d=0
so
n-1=13
n=14
- 9 years agoHelpfull: Yes(1) No(0)
- (a+d)+(a+18d)=(a+7d)+(a+14d)+(a+11d)
===> 2a+19d=3a+32d
===> a+13d
so (a+13d) is 14 term in A.P - 9 years agoHelpfull: Yes(1) No(0)
- i want options
- 6 years agoHelpfull: Yes(0) No(0)
- Tn = a + (n - 1) d,
t2 + t19 = t8 + t15 + t12
=> a+d + a+18d = a+7d + a+14d + a+11d
=> a + 13d = 0
=> t14 = 0 i.e. 14th term is zero - 5 years agoHelpfull: Yes(0) No(0)
TCS Other Question