Hi Bunuel,
I have different way but do not know it is a mere coincidence or valid approach. Is this logic ok?
36^2+37^2+38^2+39^2+40^2+41^2+42^2+43^2+44^2
Taking square of unit digits:
6^2= 36
7^2= 49
8^2=64
9^2=81
0^2=0
1^2=1
2^2=4
3^2=9
4^2=16
Adding all the values 36+49+64+81+1+4+9+16= 260
Only option C has 60 on the last. Hence the answer is C.
Atal Pandit
I have different way but do not know it is a mere coincidence or valid approach. Is this logic ok?
36^2+37^2+38^2+39^2+40^2+41^2+42^2+43^2+44^2
Taking square of unit digits:
6^2= 36
7^2= 49
8^2=64
9^2=81
0^2=0
1^2=1
2^2=4
3^2=9
4^2=16
Adding all the values 36+49+64+81+1+4+9+16= 260
Only option C has 60 on the last. Hence the answer is C.
Atal Pandit