given series: 5, 5, 6, 18, 21, 105, 110, 769, 777.
If we look closely, it appears that each number in the series is obtained by multiplying the previous two numbers and then adding 1.
5
×
+
1
=
26
5×5+1=26
6
18
109
6×18+1=109
21
105
2206
21×105+1=2206
110
769
84690
110×769+1=84690
However,
777
769×777+1 is not equal to the next number in the series:
597785
769×777+1=597785
So, the wrong term in the series is 777, and the correct option is
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Answers & Comments
given series: 5, 5, 6, 18, 21, 105, 110, 769, 777.
If we look closely, it appears that each number in the series is obtained by multiplying the previous two numbers and then adding 1.
5
×
5
+
1
=
26
5×5+1=26
6
×
18
+
1
=
109
6×18+1=109
21
×
105
+
1
=
2206
21×105+1=2206
110
×
769
+
1
=
84690
110×769+1=84690
However,
769
×
777
+
1
769×777+1 is not equal to the next number in the series:
769
×
777
+
1
=
597785
769×777+1=597785
So, the wrong term in the series is 777, and the correct option is
769
×
777
+
1
=
597785
769×777+1=597785