only genus can solve this
*with out using google
.
.
.
.
.
1+2-3+4-5.......-107=?
if u are using Google then plzz stay away
Answers
Answer:
may be its -52....
I am absolutely not sure but I just tried to guess it.
is it right ans?
if not, then please tell me the correct and and the way to solve it.
Step-by-step explanation:
according to me there exist two AP , firstly ignore 1
1st series will be 2,4,6,.....106
2nd one will be -3,-5,-7.......-107
firstly find n
an=a+(n-1)d
for 1st series | for 2nd series
106=2+(n-1)2. | -107=-3+(n-1)(-2)
104/2=n-1. | -104/-2=n-1
52+1=n. | 52+1=n=53
n=53
using formula of sum of AP series
for 1st AP. for 2nd series
sn=n(a+l)/2. =53(-3-107)(-2)
=53(2+106)/2. =53×55
=53×54. =2915
=2862
adding 1 to series 1st as it is the sum of series with +ve no.
sn become 2863
since 2nd AP is the sum of all negative num thus can be represented as -2915
adding 2863+(-2915)
we get -52
hope this will help you