Question

The numbers in this sequence increase by 7 each time. 1 8 15 22 29 . The sequence continues in the same way. Will the number 777 be in the sequence? Yes or No.

Answer 1

The numbers in the sequece minus 1 is a multiple of 7.

For example: 8 -1 = 7; 15 -1 = 14; 22 - 1= 21;  29 -1 = 28. All are multiples of 7.

What happen wiht 777? 777 - 1 = 776 which is not multiple of 7, then 777 is not in the sequence.

Answer: No.